Answer: mechanical?
Explanation:
you push a box up a ramp (friction between the box and the ramp is not negligible). call the initial state when you begin to push the box. call the final state after you have pushed the box up the ramp a distance of 0.5 m and it is moving with a speed of 2 m/s for which of the following systems does the energy remain constant? a. system: box ramp earth you b. system: box ramp c. system: you d. system: box e. system: box ramp earth f. none of the above. two cars are driving down the road. they notice that they are going to crash, so both drivers slam on the brakes. the cars skid, but still collide. the cars stick together and eventually slide to a stop. call the initial state just before the drivers apply the brakes and the final state just after the collision had occurred. treat this situation as realistically as possible. for which of the following systems does the energy remain constant? a. system: both cars b. system: both cars the ground c. system: the first car d. system: the second car e. none of the above.
For the first scenario, the system where the energy remains constant is none of the above. The correct answer is option f.
For the second scenario, the system where the energy remains constant is none of the above. The correct answer is option e.
For the first scenario,
When you push the box up the ramp, you do work on the box, which increases its kinetic energy. At the same time, there is friction between the box and the ramp, which dissipates some of the energy as heat.
The system of box, ramp, and earth is not isolated, as there is external work done on the system (by you) and energy dissipated due to friction. The total energy of the system is therefore not conserved. Therefore, option f is correct.
For the second scenario,
When the cars collide, there is an inelastic collision, and some of the kinetic energy is dissipated as heat and sound. The cars stick together and slide to a stop, which means that their final kinetic energy is zero.
Since the kinetic energy is not conserved, none of the systems listed can have a constant energy. However, if we consider the total energy of the system of both cars, the ground, and the surrounding air, there will be a slight increase in energy due to the conversion of some kinetic energy into heat and sound. Therefore, option e is correct.
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it is well known that bullets and other missiles fired at superman simply bounce off his chest. suppose that a gangster sprays superman's chest with 5.1 g bullets at the rate of 200 bullets/min, and the speed of each bullet is 680 m/s. suppose too that the bullets rebound straight back with no change in speed. what is the magnitude of the average force on superman's chest from the stream of bullets?
The rate at which the bullets are fired is 200 bullets/min, or 3.33 bullets/s. The magnitude of the average force on Superman's chest from the stream of bullets is approximately 78,299 N.
To calculate the magnitude of the average force on Superman's chest from the stream of bullets, we can use the equation for impulse:
I = FΔt
where I is the impulse, F is the force, and Δt is the time interval over which the force is applied.
Assuming that the bullets rebound straight back with no change in speed, the time interval over which each bullet is in contact with Superman's chest is given by:
Δt = 2l/v
where l is the thickness of Superman's chest, and v is the velocity of the bullet.
Substituting the given values, we get:
Δt = 2(0.1 m)/(680 m/s)
= 2.94 × 10^-4 s
The total impulse delivered to Superman's chest by each bullet is equal to its momentum change, which is given by:
I = Δp = 2mv
where m is the mass of the bullet, and v is its velocity.
Substituting the given values, we get:
I = 2(5.1 × 10^-3 kg)(680 m/s)
= 6.92 Ns
The rate at which the bullets are fired is 200 bullets/min, or 3.33 bullets/s. Therefore, the total impulse delivered to Superman's chest per second is:
I_tot = 3.33 bullets/s × 6.92 Ns/bullet
= 23.04 Ns/s
The average force on Superman's chest can be calculated by dividing the total impulse by the time interval over which it is delivered:
F_avg = I_tot/Δt
= 23.04 Ns/s / 2.94 × 10^-4 s
= 78,299 N
This is an enormous amount of force, far greater than any normal human could withstand. However, since Superman is a fictional character with superhuman strength and invulnerability, he can withstand this force without harm.
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identify which, if any, conditions of equilibrium hold for the following situations: a. a bicycle wheel rolling along a level highway at a constant speed. b. a bicycle parked against the curb c. the tires on a braking automobile that is still moving. d. a football traveling through the air.
The conditions of equilibrium do not hold in this situation. d. A football traveling through the air: A football traveling through the air is also an example of dynamic equilibrium. In this case, the forces of gravity and air resistance are balanced, allowing the football to continue moving at a constant speed.
A bicycle wheel rolling along a level highway at a constant speed: The bicycle wheel rolling along a level highway at a constant speed is an example of dynamic equilibrium. It means that the forces acting on the wheel are balanced, as there is no net force acting on the wheel. The forces of gravity, air resistance, and friction are all balanced, which allows the wheel to keep moving at a constant speed. So, the conditions of equilibrium that hold in this situation are dynamic equilibrium. b. A bicycle parked against the curb: When a bicycle is parked against the curb, it is in a state of static equilibrium.
This means that the forces acting on the bike are balanced, and there is no motion occurring. In this situation, the conditions of equilibrium that hold are static equilibrium. c. The tires on a braking automobile that is still moving: When the tires on a braking automobile are still moving, the forces acting on them are not balanced, and they are not in equilibrium. The force of the brakes applied to the tires is greater than the forces of gravity and friction acting on the tires. This results in a net force that slows the car down.
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if the car has rubber tires and the track is concrete, at what time does the car begin to slide out of the circle?
When the car's speed exceeds the maximum velocity for circular motion, it begins to slide out of the circle.
The vehicle will start to slide out of the circle when the power of grating between the elastic tires and the substantial track is as of now not adequate to give the important centripetal power expected to keep the vehicle moving in a roundabout way. This happens when the vehicle's speed surpasses a specific breaking point known as the most extreme speed for round movement. The most extreme speed for round movement relies upon the coefficient of contact between the tires and the track, the span of the round way, and the speed increase because of gravity.
Elastic tires have a higher coefficient of static grating than motor grinding. At the point when the vehicle moves in a round way, the tires experience both static and motor grating. Static grating becomes possibly the most important factor when the tires are not sliding against the track, while active contact happens when the tires begin sliding. Hence, the greatest speed for round movement is restricted by the coefficient of static contact between the tires and the track.
Expecting that the vehicle is moving in an even roundabout way, the greatest speed can be determined utilizing the recipe:
vmax = sqrt(mu * g * r)
Where mu is the coefficient of static contact, g is the speed increase because of gravity, and r is the sweep of the round way.
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a chain 73 meters long whose mass is 22 kilograms is hanging over the edge of a tall building and does not touch the ground. how much work is required to lift the top 12 meters of the chain to the top of the building? use that the acceleration due to gravity is 9.8 meters per second squared. hint: don't forget that when you lift the top 12 meters of the cable you are also lifting the bottom 61 meters of the cable, just not all the way to the top.
The work required to raise the pinnacle 12 meters of the chain to the top of the building is 13,139.6 Joules.
weight = mass x acceleration due to gravity
weight = 22 kg x 9.8 m/s² = 215.6 N
for this reason, the work required to raise the pinnacle 12 meters of the chain is:
work = force x distance = weight x distance = (215.6 N) x (61 m) = 13,139.6 J
Work is defined as the product of the force acting on an object and the displacement of the object in the direction of the force. Work is a scalar quantity, meaning it has magnitude but no direction. Work is an important concept in many areas of physics, including mechanics, thermodynamics, and electromagnetism.
In mechanics, work is used to describe the energy required to move an object or to change its velocity. In thermodynamics, work is used to describe the energy required to change the state of a system. In electromagnetism, work is used to describe the energy required to move a charged particle in an electric field or to change the magnetic field in a given region. Work is a fundamental concept in physics and is essential for understanding the behavior of many physical systems.
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8. Which of the following is true about conductors?
A) Conductors have loosely bound valance electrons
B) Conductors allow electricity to flow through it easily
C) most metals are good conductors
D) All of the above
Which unit abbreviation is a measurement of force?
A. m/s
B. m/s²
C. N
D. N/s
The unit abbreviation that represents a measurement of force is C. N, which stands for Newton.
What is newton unit?ewton is the force unit derived from the International System of Units (SI). It is named after Sir Isaac Newton, widely acknowledged as one of the most influential scientists of all time. The force required to accelerate a mass of one kilogram at a rate of one meter per second squared (m/s2) is referred to as one Newton.
Choice A, m/s, addresses an estimation of speed or speed (meters each second), while
choice B, m/s², addresses an estimation of speed increase (meters each second squared), which is connected with force, however not the unit of power itself.
Choice D, N/s, addresses an estimation of the pace of progress of power after some time, which is certainly not a generally involved unit in physical science.
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consider what happens when you push both a needle and the blunt end of a pen against your skin with the same force. what will determine whether your skin will be punctured?
When you push both a needle and the blunt end of a pen against your skin with the same force, the needle will puncture your skin because it exerts a greater pressure than the blunt end of a pen. The factor that determines whether your skin will be punctured is pressure.
Pressure is defined as the force acting per unit area. Force is the result of the interaction between two objects that are in contact. It is a scalar quantity that is expressed in units of Newtons (N).
When you push both a needle and the blunt end of a pen against your skin with the same force the pressure will be different for both the needle and the pen.
A needle has a small surface area, whereas the blunt end of a pen has a larger surface area. The smaller the surface area of an object, the greater the pressure it exerts on an object. The larger the surface area of an object, the lower the pressure it exerts on an object.
Therefore, a needle exerts a greater pressure than the blunt end of a pen. So, When you push a needle against your skin with the same force as a blunt end of a pen, the needle will puncture your skin.
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a permanent bar magnet with the south pole pointing downward is dropped through a solenoid, as shown in the illustration.what is the direction of the induced current that would be measured in the ammeter as the magnet falls completely through the solenoid?
A permanent bar magnet with the south pole pointing downward is dropped through a Solenoid, as shown in the illustration.
The direction of the induced current that would be measured in the ammeter as the magnet falls completely through the solenoid is given by the left-hand rule.
According to this rule, if the thumb of the left hand points in the direction of the force on a positive charge, then the fingers will point in the direction of the magnetic field that is generating the force, and the palm will face in the direction of the motion of the charge.
The magnetic field in the solenoid is perpendicular to the direction of motion of the magnet, and the force generated is towards the center of the solenoid. Therefore, the induced current that would be measured in the ammeter as the magnet falls completely through the solenoid is in a clockwise direction.
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Two sumo wrestlers are in a match. At the start of the match, they both lunge at each other. They hit and miraculously come to a standstill. One wrestler was 200kg and traveling at a velocity of 2.3m/s at the instance of collision. If the other wrestler was traveling at 2.9m/s, what is his mass?
This issue can be resolved by applying the momentum conservation principle. The total amount of momentum prior to and following the impact are equal. This can be expressed as:
(M1 + M2)vf = m1v1 + m2v2
m1 equals 200 kilograms (mass of wrestler 1)
v1 = 2.3 m/s (velocity of wrestler 1) (velocity of wrestler 1)
v2 = 2.9 m/s (velocity of wrestler 2) (velocity of wrestler 2)
m2 = the wrestler's mass two (unknown)
vf is the wrestlers' combined final speed before the collision (which we know is zero)
It's the same response we previously received. The problem is that the negative sign shows that Wrestler 2's velocity is moving in the opposite direction from Wrestler 1's velocity. Wrestler 2 is therefore traveling against the current. To gather the wrestlers in bulk
If r 2 is 2, we can omit the minus sign and use the absolute value instead:
As a result, wrestler 2 weighs roughly 158.62 kg.
What's a good illustration of momentum and impulse?In order to change the momentum of an object, you must exert a certain amount of force over a specific period of time. It is because of this. For instance, when you strike a ball with a cricket bat, you exert power temporarily (in this case, very briefly) in order to change (or transfer) the momentum of the ball. |m2| = 158.62 kg
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a long piece of thin wire is looped into a circle of radius 0.79 m and the loop rests flat on a table top. a uniform magnetic field of 3.58 t points exactly vertical out of the table top. we take the ends of the wire and pull them in opposite directions such that the circular shape of the loop is maintained, but the loop's area is rapidly reduced to zero in a period of 0.623 s. (in other words, we aren't pulling the wire ends apart to open the loop, we'll pulling them past one another in opposite directions, maintaining the loop while we pull the ends of the wire.) what is the emf induced in the loop while we are pulling on the ends?
The emf induced in the loop while we are pulling on the ends is 28.5 V.
The formula for emf induced in a loop is:
ϵ=−dΦdt=−d(BAcosθ)dt
Where
ϵ = emf induced in the loop
dΦdt = change in magnetic flux with time
B = magnetic field
A = area of the loop
θ = angle between the normal to the loop and the direction of magnetic field
d(BAcosθ)dt = rate of change of magnetic flux with time
The given values are:
B = 3.58 T
A = πr² = π (0.79)² = 1.963 m²
θ = 0° = cosθ = 1
d(BAcosθ)dt = BAdcosθdt
As the loop's area is rapidly reduced to zero in a period of 0.623 s,
dA/dt = πr² / (0.623 s) = (π x 0.79²) / (0.623) = 3.99 m²/s
Substituting the values,
ϵ=−d(BAcosθ)dt=−BAdcosθdt=−(3.58)(1.963)(1)(3.99)=−28.5 V
Taking the absolute value,
ϵ=28.5 V
But since the direction of the emf is opposite to the direction of the current in the loop, we get the answer as:
-ϵ =−28.5 V
ϵ = 28.5 V
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f the magnetic field steadily decreases from b to zero during a time interval t , what is the magnitude i of the induced current?
The magnitude of the induced current is proportional to the rate of change of the magnetic field, and it is inversely proportional to the time interval during which the magnetic field decreases from b to zero.
When the magnetic field steadily decreases from b to zero during a time interval t, the magnitude i of the induced current is given by the equation:
i = ΔΦ/Δt
where ΔΦ is the change in magnetic flux and Δt is the time interval during which the magnetic field decreases from b to zero. The magnitude of the induced emf is given by the equation:
e = -dΦ/d t
where dΦ/dt is the rate of change of magnetic flux with respect to time.
Since the induced current is proportional to the induced emf, we can write:
i ∝ e
By applying Lenz's law, we can determine the direction of the induced current. Lenz's law states that the direction of the induced current is such that it opposes the change in magnetic flux that produced it. In this case, since the magnetic field is decreasing, the induced current will create a magnetic field that opposes this decrease. Therefore, the induced current will flow in a direction such that it creates a magnetic field that is directed upward. The magnitude of the induced current can be found by using the equation:
i = ΔΦ/Δt
= (b - 0)/t
= b/t
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if you use copper wire with a 0.57 mm diameter as the heating element, how long should the wire be if you want to generate 16 w of heating power? express your answer to two significant figures and include the appropriate units.
The length of copper wire needed to provide 16 W of heating power is determined by various parameters, including the wire's resistivity and the voltage applied to it.
We may use the formula P = (V2)/R, where P is power, V is voltage, and R is resistance, assuming a standard voltage of 120 V and a resistivity of 1.68 x 10-8 m for copper wire. The resistance of the wire may be determined using the formula R = (L)/A, where is the resistivity, L is the wire's length, and A is the wire's cross-sectional area. The cross-sectional area of a wire with a diameter of 0.57 mm may be computed using the formula A = r2, where r is the wire's radius. We may use the cross-sectional area to calculate the length of wire required to provide 16 W of heating power. When we solve for L, we get: L = (1.68 x 10-8 m)((0.57/2 x 10-3 m)2)(16 W)/(120 V)2 3.09 m As a result, a copper wire with a diameter of 0.57 mm and a length of around 3.09 m would create 16 W of heating power.
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Water is flowing through a pipe of two circular cross sectional areas A1 and A2 laid horizontally as shown below. The pressure difference between those two cross sectional areas is 104 Pascal. If the velocity of the water through cross section A2 is 6 m/s, what would be the velocity of the water through cross section A1? Assume acceleration due to gravity (g) =10 ms-2
The velocity of the water through cross section [tex]A_1[/tex] is approximately 2.26 m/s.
According to the principle of continuity, the mass flow rate of water through the pipe must remain constant. This means that the product of the cross-sectional area and velocity of the water must be constant along the pipe. Mathematically, we can express this as:
[tex]A_1v_1 = A_2v_2[/tex]
where [tex]A_1[/tex] and [tex]A_2[/tex] are the cross-sectional areas of the pipe at sections 1 and 2, respectively, and [tex]v_1[/tex] and [tex]v_2[/tex] are the velocities of the water at sections 1 and 2, respectively.
We also know that the pressure difference between sections 1 and 2 is 104 Pa. Using Bernoulli's equation, we can relate this pressure difference to the velocity difference between the two sections:
[tex]P_1[/tex] + 1/2ρ[tex]v_1^2[/tex] =[tex]P_2[/tex] + 1/2ρ[tex]v_2^2[/tex]
where[tex]P_1[/tex] and [tex]P_2[/tex] are the pressures at sections 1 and 2, respectively, and ρ is the density of water.
Assuming the pipe is open to the atmosphere at both ends, we can set [tex]P_1[/tex] = [tex]P_2[/tex]= [tex]P_a_t_m[/tex], where [tex]P_a_t_m[/tex] is the atmospheric pressure.
Substituting the expression for [tex]A_1v_1[/tex] from the continuity equation into the Bernoulli's equation, we get:
[tex]P_a_t_m[/tex] + 1/2ρ[tex]v_1^2[/tex] = [tex]P_a_t_m[/tex] + 1/2ρ[tex]v_2^2[/tex] + 104
Canceling out the atmospheric pressure terms, simplifying, and solving for [tex]v_1[/tex], we get:
[tex]v_1[/tex] = [tex]v_2[/tex] * sqrt[tex](A_2/A_1)[/tex] * sqrt(1 - 2104/(ρ[tex]v_2^2[/tex] ))
Substituting the given values, we get:
[tex]v_1[/tex] = 6 m/s * sqrt(1/4) * sqrt(1 - 2104/([tex]10006^2[/tex])) ≈ 2.26 m/s
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Hint In the previous sections, you found v² = 2ugd and determined you could
plot v² on the vertical axis and d on the horizontal axis to get a straight line
where the slope is equal to 2µg.
Answer:
Explanation:
Based on the given hint, it appears that the question is related to the analysis of a physics experiment involving the relationship between velocity, distance, and acceleration due to gravity.
Given that the formula v² = 2ugd is being used, it suggests that the experiment involves dropping an object from a height d and measuring the distance it travels over time, as well as the final velocity it reaches. By plotting the squared velocity (v²) on the vertical axis and distance (d) on the horizontal axis, a straight line can be obtained with a slope of 2ug, where u is the coefficient of friction and g is the acceleration due to gravity.
However, without further information or data from the experiment, it is impossible to determine the specific value of the scale factor used.
(refer to code example 8-1) if none of the h2 elements that use this event handler include a class attribute when the application starts, what happens the first time the user clicks on an h2 element?
a. A class named "minus" is added to the element and the element's next sibling is displayed. b. A class named "minus" is added to the element and the element's next sibling is hidden. c. Nothing happens because the click) event method is used instead of the on event method. d. Nothing happens because the event object isn't passed to the function for the event handler.
d. Nothing happens because the event object isn't passed to the function for the event handler.
Assuming the code example 8-1 you are referring to is a JavaScript code example that adds an event listener to all h2 elements in the document, the answer to your question would be: Nothing happens because the event object isn't passed to the function for the event handler.
In the code example, the event object is not passed as a parameter to the function that handles the click event, so the function cannot access the event object's properties and methods.
Without the event object, the function cannot determine which h2 element was clicked or perform any actions in response to the click event. Therefore, the function will not add the "minus" class to the clicked element or hide/show its next sibling.
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compare the leakage current ratio of a transistor under the following configurations? γ = 1, η = 0.1, φf = 0.35 v, vdd = 1 v, t = 300k, vth0 = 0.4 v (threshold voltage without dibl and body effects).
To compare the leakage current ratio of a transistor under different configurations, we need to calculate the leakage current in each case and compare their ratios.
Let's consider the following configurations: Configuration 1: γ = 1, η = 0.1, φf = 0.35 V
Configuration 2: γ = 1, η = 0.1, φf = 0 V
Configuration 3: γ = 1, η = 0, φf = 0 V
Assuming the transistor operates in saturation region, the drain current (I_d) and the leakage current (I_leak) can be expressed as:
I_d = γ/2 * β * (v_gs - vth)^2
I_leak = I_sub + I_d0 * exp(v_ds/η * vth) + I_g0 * exp(v_gs/η * vth)
where: γ is the body effect coefficient (equal to 1 for this problem)
β is the transconductance coefficient (unknown)
v_gs is the gate-source voltage
vth is the threshold voltage with body effect
v_ds is the drain-source voltage
η is the subthreshold swing coefficient
φf is the bulk potential (in volts)
vdd is the supply voltage
t is the temperature in Kelvin
I_sub is the substrate current (unknown)
I_d0 is the drain current at v_gs = vth and v_ds = 0 (unknown)
I_g0 is the gate current at v_gs = vth and v_ds = 0 (unknown)
We can simplify the expressions by assuming v_gs = v_dd - v_ds, and neglecting the gate current (I_g0) and the substrate current (I_sub). This is a reasonable assumption for most cases, where these currents are usually much smaller than the drain current.
With these assumptions, the expressions become:
I_d = γ/2 * β * (v_dd - v_ds - vth)^2
I_leak = I_d0 * exp(v_ds/η * vth)
Now, let's calculate the leakage current for each configuration, assuming v_ds = 0.1 V:
Configuration 1:
I_d = 0.5 * β * (0.65 V)^2
I_leak = I_d0 * exp(0.1/η * 0.4 V)
Configuration 2:
I_d = 0.5 * β * (1 V)^2
I_leak = I_d0 * exp(0.1/η * 0.4 V)
Configuration 3:
I_d = 0.5 * β * (1 V)^2
I_leak = I_d0 * exp(0.1/0.4 * 0 V)
We can see that the drain current is the same for configurations 2 and 3, and it is higher for configuration 1. This is because configuration 1 has a higher bulk potential, which reduces the threshold voltage and increases the drain current.
To compare the leakage current ratio, we need to assume some values for the unknown parameters. Let's assume β = 1 μA/V^2, I_d0 = 1 nA, and v_dd = 1 V. With these values, we can calculate the leakage current for each configuration:
Configuration 1:
I_leak = 1 nA * exp(0.1/0.4 * 0.35 V) ≈ 0.020 nA
Configuration 2:
I_leak = 1 nA * exp(0.1/0.4 * 0)
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newton's second law: a block is on a frictionless horizontal table, on earth. this block accelerates at 1.8 m/s2 when a 120 n horizontal force is applied to it. the block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. what is the weight of the block on the moon?
Answer:
108N
Explanation:
F = ma
m = F/a = 120/1.8 = 200/3 kg
Now, Weight = mg = 200/3 * 1.62 = 108N
The weight of the block on the moon is 26.4 N.
To find the weight of the block on the moon, first, use Newton's second law (F = ma) to determine the mass of the block on Earth. The horizontal force (F) is 120 N, and the acceleration (a) is 1.8 m/s².
Divide the force by acceleration (120 N / 1.8 m/s²) to get the mass (m), which is 66.67 kg. Now, you can calculate the weight (W) on the moon using W = mg, where g is the acceleration due to gravity on the moon (1.62 m/s²).
Multiply the mass by the moon's gravity (66.67 kg * 1.62 m/s²) to obtain the weight of the block on the moon, which is 26.4 N.
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if the system absorbs 196 j of heat, and the surroundings do 117 j of work on the system, what is the change in internal energy of the system ? group of answer choices 79 j - 79 j -229 j 313 j
The change in internal energy of the system is 79 J. The answer is option a.
Internal energy is the total energy that a system possesses as a result of the random motion and interactions of its constituent particles, such as atoms and molecules. The change in internal energy of the system is given by the first law of thermodynamics as,
ΔU = Q - W
where ΔU is the change in internal energy, Q is the heat absorbed by the system, and W is the work done on the system by the surroundings.
Substituting the given values, we get:
ΔU = 196 J - 117 J
ΔU = 79 J
Option a is correct.
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a dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. for the next loading, the spring is compressed a distance 6d. how much work is required to load the second dart compared to that required to load the first?
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. for the next loading, the spring has compressed a distance 6d. It requires 36 times more work to load the second dart compared to the first.
To determine the amount of work required to load the second dart compared to the first, we can use the formula for work done on a spring:
Work = (1/2) * k * x^2
Here, k is the spring constant and x is the distance the spring is compressed.
For the first dart, the work required is:
Work1 = (1/2) * k * d^2
For the second dart, the spring is compressed by a distance of 6d, so the work required is:
Work2 = (1/2) * k * (6d)^2
Now, we can find the ratio of the work required for the second dart to that of the first:
Work2 / Work1 = [(1/2) * k * (6d)^2] / [(1/2) * k * d^2]
The spring constant k and (1/2) are common factors and can be cancelled out:
Work2 / Work1 = (6d)^2 / d^2
By squaring 6d:
Work2 / Work1 = 36d^2 / d^2
The d^2 terms cancel out, leaving:
Work2 / Work1 = 36
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a playground merry-go-round has a mass of 120 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.400 rev/s. what is its angular velocity (in rev/s) after a 24.0 kg child gets onto it by grabbing its outer edge? the child is initially at rest.
The final angular velocity of the merry-go-round with the child on it is 0.064 rev/s.
Before the child gets onto the merry-go-round, the angular momentum of the system is:
L1 = I1 * ω1
where I1 is the moment of inertia of the merry-go-round and ω1 is its initial angular velocity. The moment of inertia of a solid cylinder is given by:
I1 = 0.5 * M1 * R1²
where M1 is the mass of the merry-go-round and R1 is its radius. Substituting the given values, we get:
I1 = 0.5 * 120 kg * (1.80 m)² = 388.8 kg m²
Substituting this into the equation for angular momentum, we get:
L1 = 388.8 kg m² * 0.400 rev/s = 155.52 kg m²/s
When the child gets onto the merry-go-round, the moment of inertia of the system increases, and the angular velocity decreases to conserve angular momentum. The moment of inertia of the system with the child on it is:
I2 = I1 + M2 * R1²
where M2 is the mass of the child. Substituting the given values, we get:
I2 = 0.5 * 120 kg * (1.80 m)² + 24.0 kg * (1.80 m)² = 608.4 kg m²
To find the new angular velocity, we can rearrange the equation for angular momentum and substitute the new moment of inertia and the initial angular momentum:
L2 = I2 * ω2
ω2 = L2 / I2
The initial angular momentum is the same as the final angular momentum, so:
L1 = L2
Substituting the values, we get:
155.52 kg m²/s = 608.4 kg m² * ω2
ω2 = 0.064 rev/s
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oh there was a really weird one it was like: two astronauts, one 60kg and another 80kg are in space and first start at rest. they then push on each other so they fly apart. when the heavier astronaut is 15m from the starting position, how far apart are the two astronauts? (edited) [7:41 pm]
The two astronauts are 12m apart when the heavier astronaut is 15m from the starting position.
When the two astronauts push on each other, they experience equal and opposite forces due to the conservation of momentum. According to Newton's third law of motion, the force exerted by the lighter astronaut on the heavier one is equal in magnitude and opposite in direction to the force exerted by the heavier astronaut on the lighter one.
Let us assume that after they push off, the lighter astronaut moves in one direction with velocity v₁ and the heavier astronaut moves in the opposite direction with velocity v₂. By conservation of momentum, we have:
m₁v₁ + m₂v₂ = 0
where m₁ and m₂ are the masses of the lighter and heavier astronauts, respectively.
Let us also assume that they move for some time t before coming to a stop. During this time, the lighter astronaut travels a distance of x₁ = v₁t and the heavier astronaut travels a distance of x₂ = v₂t.
We know that the distance between them is 15m when the heavier astronaut has moved a distance of 15m. Therefore:
x₁ + x₂ = 15
Substituting x₁ = v₁t and x₂ = v₂t, we get:
v₁t + v₂t = 15
t(v₁ + v₂) = 15
From the conservation of momentum equation, we have:
v₂ = -(m₁/m₂)v₁
Substituting v₂ in terms of v₁, we get:
t(v₁ - (m₁/m₂)v₁) = 15
Simplifying, we get:
v₁t = (m₂/(m₁ + m₂)) * 15
v₂t = (m₁/(m₁ + m₂)) * 15
The distance between the astronauts after they come to a stop is the sum of the distances each astronaut has traveled:
x = x₁ + x₂
x = v₁t + v₂t
Substituting the values of v₁t and v₂t, we get:
x = 15(m₁m₂)/((m₁ + m₂)²)
Substituting the given values of m₁ and m₂, we get:
x = 15(60x80)/(140²)
x = 0.6857 m
Therefore, when the heavier astronaut is 15 meters away from the starting position, the distance between the two astronauts is 12 meters.
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In the drawing below, R1 has a resistance of 6.8 Ω and R2 has a resistance of 1.9-Ω. Determine the current (magnitude and direction) in the 6.8 and 1.9-Ω resistors in the drawing.
For the 6.8 Ω resistors, the voltage across it is V1 = 4.0 V, so the current through it is I1 = V1 / R1 = 4.0 V / 6.8 Ω = 0.588 A
For the 1.9 Ω resistors, the voltage across it is V2 = 12 V, so the current through it is:
I2 = V2 / R2 = 12 V / 1.9 Ω = 6.32 A, directed from the negative terminal of V2 to the positive terminal.
Therefore, the current in the 6.8 Ω resistor is 0.588 A directed from the positive terminal of V1 to the negative terminal, and the current in the 1.9 Ω resistor is 6.32 A directed from the negative terminal of V2 to the positive terminal.
What are resistors?Resistors are electronic components used in electrical circuits to provide a specific amount of resistance to the flow of electric current. They are designed to impede the current flow and reduce the amount of voltage flowing through a circuit.
What does a circuit consist of?An electrical circuit consists of a closed loop of conductive material through which electric current can flow. A circuit typically includes a power source, wires to connect the components, and various components such as resistors, capacitors, inductors, diodes, and transistors, among others.
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falling raindrops frequently develop electric charges. does this create noticeable forces between the droplets? suppose two 1.8 mg drops each have a charge of 25 pc . the centers of the droplets are at the same height and 0.44 cm apart.
As falling raindrops frequently develop electric charges, there is a noticeable force between the droplets. The force that exists between two charged objects is known as the electric force.
The direction of the electric force depends on the types of charges involved. Like charges, such as two positively or negatively charged droplets, repel each other. Opposite charges, on the other hand, attract each other.
When two droplets that have electric charges of 25 pc each are placed 0.44 cm apart, the electrical force between them can be calculated using Coulomb's law. Coulomb's law is a basic law of physics that describes the interactions between electric charges. The law states that the force between two charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.
The formula for Coulomb's law is:
F = [tex]k\frac{q{1} q{2}}{r^{2} }[/tex]
where F is the force between the charges, k is the Coulomb constant (9 x 10⁹ Nm²/C²), q₁ and q₂ are the charges on the droplets, and r is the distance between the centers of the droplets.
Using this formula, the force between the two droplets is:
F = [tex]\frac{9*10^9 * 25*10^{-12}}{0.44*10^{-2}}[/tex]
F = 4.8 x 10⁻¹⁰ N
The electric force between the two droplets is therefore 4.8 x 10⁻¹⁰ N.
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how are microphones used in cochlear implants? a. they are external components that stimulate the stapedius. b. they are internal components that send sound waves to the brain. c. they are external components that pick up sound from the environment. d. they are internal components that pick up radio waves.
Microphones in cochlear implants are external components that pick up sound from the environment. (C)
Cochlear implants consist of two main parts: an external component and an internal component. The external component includes a microphone, a processor, and a transmitter. The microphone's role is to capture sound from the environment.
These captured sounds are then processed and converted into digital signals by the processor. The transmitter sends these digital signals to the internal component, which consists of a receiver and an electrode array.
The receiver collects the signals and sends them to the electrode array, which stimulates the auditory nerve, allowing the brain to perceive the sound. In this way, microphones play a crucial role in helping cochlear implant users hear and interpret sounds from their surroundings.(C)
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consider two circular metal wire loops each carrying the same current i as shown below. in what regions could the net magnetic field b be equal to zero?
The net magnetic field B between two circular wire loops carrying the same current can be equal to zero in the region between the loops if the loops are perpendicular to each other.
The magnetic field generated by a current-carrying loop of wire depends on the distance from the loop and the orientation of the loop. To determine where the net magnetic field B between the two loops is zero, we need to consider the contributions to the field from each loop and the relative positions and orientations of the two loops.The magnetic field lines produced by each loop are in the same direction, and they add up to produce a net magnetic field between the two loops that is not zero. Therefore, there is no region where the net magnetic field B is zero.The magnetic field lines produced by one loop are perpendicular to the magnetic field lines produced by the other loop. Therefore, there is a region between the two loops where the magnetic field lines cancel out, and the net magnetic field B is zero. This region is a plane that is equidistant from the two loops and perpendicular to both of them.To know more about magnetic field
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open the switch (turn it off) and place two rod-shaped magnets on the plastic stand, with the north pole of one magnet near the wire, and the south pole of the second magnet on the opposite side near the wire. this creates a strong magnetic field around the wire. when the switch is closed (turned on), what direction will the wire deflect?
The direction of the deflection of the wire will be determined by Fleming's left-hand rule. Here force will be perpendicular to both current and the magnetic field. So wire will deflect in a perpendicular direction to magnetic field.
Fleming's left-hand rule says if you point your thumb in the direction of the current, and finger can be in the direction of the magnetic field, then palm faces direction of the force.
We are placing two magnets as north pole of one magnet near the wire, and the south pole of the second magnet on the opposite side near the wire.
When the switch closed , wire will deflect perpendicular to the direction of the magnetic field.
Wire carries an electric current and when it comes with the magnetic field created by magnets, a force will be exerted on the wire. This direction will say using Fleming's left-hand rule.
Here force will be perpendicular to both current and the magnetic field. So wire will deflect in a perpendicular direction to magnetic field.
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write down an explanation, based on a scientific theory, of why a rocket launched from mars will work even if its exhaust does not push on the surface of mars. explain why it is scientific. then, write a non-scientific explanation of the same phenomenon, and explain why it is non-scientific. then, write a pseudoscientific explanation of the same phenomenon, and explain why it is pseudoscientific.write down an explanation, based on a scientific theory, of why a rocket launched from mars will work even if its exhaust does not push on the surface of mars. explain why it is scientific. then, write a non-scientific explanation of the same phenomenon, and explain why it is non-scientific. then, write a pseudoscientific explanation of the same phenomenon, and explain why it is pseudoscientific.
Because of Newton's Third Law of Motion a rocket launched from Mars may travel even without pressing on the surface. The rocket's exhaust releases gas at high speeds, causing an action in one direction and an equal and opposite reaction in the other, propelling the rocket ahead. Unlike non-scientific or pseudoscientific explanations, this one is scientific and based on known scientific concepts.
Explanation based on a scientific theory: A rocket launched from Mars will work even if its exhaust does not push on the surface of Mars because of the scientific principle known as Newton's Third Law of Motion. The law states that for every action, there is an equal and opposite reaction. When a rocket is launched, it expels a large amount of gas at high speed, which creates an action in one direction.
This creates an opposite and equal reaction in the opposite direction, which propels the rocket forward. This is why rockets can move in the vacuum of space without the need for a surface to push against. It is scientific because it is based on an established scientific law and has been tested and confirmed through experiments and observations.
Non-scientific explanation of the same phenomenon: A rocket launched from Mars will work even if its exhaust does not push on the surface of Mars because it has a powerful engine that propels it forward. This explanation is non-scientific because it does not provide a clear understanding of the scientific principles involved in rocket propulsion and does not take into account the fact that rockets can move in the vacuum of space.
Pseudoscientific explanation of the same phenomenon:A rocket launched from Mars will work even if its exhaust does not push on the surface of Mars because it taps into the mysterious and powerful energy of the universe. This explanation is pseudoscientific because it is based on unproven and unfounded claims about the nature of the universe and does not take into account the scientific principles involved in rocket propulsion.
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the conductor coming from the ground / neutral bar in the sep and is connected to the grounding rod driven into the earth is called what
The conductor that you are referring to, which comes from the ground or neutral bar in the service entrance panel (SEP) and connects to the grounding rod driven into the earth, is called the "grounding electrode conductor" (GEC).
Here is a step-by-step explanation of the process:
1. Locate the service entrance panel (SEP), where electricity enters your building from the utility company. This panel contains a ground or neutral bar, which serves as the central grounding point for the electrical system.
2. Identify the grounding electrode conductor (GEC) connected to the ground or neutral bar in the SEP. This conductor is typically a thick, copper or aluminum wire designed to carry fault currents safely to the earth.
3. Follow the GEC from the SEP to the grounding rod, which is a metal rod driven into the earth near your building. The grounding rod provides a direct connection to the earth, ensuring that any electrical faults are safely dispersed.
4. Understand that the GEC serves a crucial role in maintaining electrical safety in your building by providing a path for fault currents to be safely discharged into the earth, preventing damage to electrical equipment and reducing the risk of electrical shock.
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a 0.35-kg ball moving in a circle at the end of a string has a centripetal acceleration of 12 m/s2. determine the magnitude of the centripetal force exerted by the string on the ball to produce this acceleration.
The magnitude of the centripetal force exerted by the string on the ball is 4.2 N.
Centripetal force is the force that acts on an object moving in a circular path, directed toward the center of the circle. It is required to maintain the object's circular motion and is proportional to the object's mass, the square of its speed, and inversely proportional to the radius of the circle.
The centripetal force (Fc) exerted on an object moving in a circle is given by, Fc = m * a
where m is the mass of the object and a is its centripetal acceleration.
In this case, m = 0.35 kg and a = 12 m/s^2. Therefore:
Fc = (0.35 kg) * (12 m/s^2) = 4.2 N
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