Assuming both rocks are thrown from the same height and with the same initial speed, the rock thrown vertically downward will have a larger velocity upon hitting the ground than the rock thrown vertically upward.
This is because the rock thrown upward will lose speed as it moves against the force of gravity. Eventually, the upward motion will be slowed down until the rock reaches the highest point in its trajectory, where it momentarily stops and changes direction. From that point, the rock will accelerate downward, gaining speed as it falls back to the ground. However, the time spent traveling upward and the time spent traveling downward will not be the same, since the upward portion of the trajectory will be slower due to gravity slowing the rock's ascent. This means that the rock thrown upward will have a lower speed when it hits the ground compared to the rock thrown downward.
On the other hand, the rock thrown downward will experience the force of gravity pulling it towards the ground, causing it to accelerate and gain speed as it falls. Since it is initially moving downward, it will not slow down until it hits the ground, meaning that it will have a higher velocity upon impact than the rock thrown upward.
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What is the mass of a student who weighs 524 newton
Mass of the student is approximately 53.47 kilograms.
The mass of a student who weighs 524 Newton can be calculated using the formula: Weight = Mass x Gravity
Assuming the acceleration due to gravity is approximately 9.8 meters per second squared on the Earth's surface : Mass = Weight / Gravity
Substituting the given weight of 524 Newton, we get:
Mass = 524 N / 9.8 m/s^2 ≈ 53.47 kg
The mass of the student is approximately 53.47 kilograms. It is important to note that mass is a measure of the amount of matter in an object and is different from weight, which is the force exerted on an object due to gravity.
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A dog can hear sounds in the range from 15
to 50,000 Hz.
What wavelength corresponds to the lower
cut-off point of the sounds at 20◦C where the
sound speed is 344 m/s?
Answer in units of m.
Explanation:
Speed of sound is 344
The frequency corresponding to the lower cut-off point is the lowest frequency which his 15Hz
F=15Hz
The relationship between the wavelength, speed and frequency is given as
v=fλ
Then,
λ=v/f
λ=v/f
λ=344/15
λ=22.93m
the sound level measured in a room by a person watching a movie on a home theater system varies from 60 db during a quiet part to 90 db during a loud part. approximately how many times louder is the latter sound?
The loud part is approximately 1000 times louder than the quiet part. The sound level measured in a room by a person watching a movie on a home theater system varies from 60 db during a quiet part to 90 db during a loud part.
To calculate approximately how many times louder the latter sound is, we can use the formula: Decibels = 10 log (I/I0) Where I is the sound intensity and I0 is the reference intensity ([tex]10^{-12} W/m^2[/tex]). We know that the sound level at the quiet part is 60 dB and the sound level at the loud part is 90 dB.
So, using the formula above, we can calculate the intensity ratio as follows: Intensity ratio = I_loud/I_quiet= [tex]10^{(90/10)}[/tex]/ [tex]10^{(60/10)}[/tex]= [tex]10^9[/tex]/[tex]10^6[/tex]= 1000. The intensity ratio of the loud part to the quiet part is 1000. This means that the loud part is approximately 1000 times louder than the quiet part. The answer is 1000 times louder than the quiet part.
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calculate the resultant velocity of an airplane that normally flies at 250 km/h if it encounters a 50-km/h tailwind. answer in units of km/h.
The resultant velocity of an airplane that normally flies at 250 km/h with a 50-km/h tailwind is 300 km/h.
This is because the velocity of the tailwind adds to the airplane's velocity, creating a total velocity of 300 km/h.
Velocity is the speed at which something moves in a particular direction. It can increase or decrease depending on what it encounters on its path.
To calculate the resultant velocity, use the equation:
Resultant Velocity = (Initial Velocity + Wind Velocity)
Resultant Velocity = (250 km/h + 50 km/h)
Resultant Velocity = 300 km/h
Therefore, the resultant velocity of an airplane when it encounters a 50 km/h tailwind is 300 km/h.
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if a star is 11 pc away from us, will its apparent visual magnitude be higher or lower than its absolute visual magnitude? what if the star is 5 pc away?
If a star is 11 pc away from us, its apparent visual magnitude will be lower than its absolute visual magnitude. The star's apparent magnitude would be only 0.38 magnitudes lower than its absolute magnitude.
This is because the apparent magnitude of a star is affected by its distance from us. As the distance increases, the star appears dimmer, and its apparent magnitude decreases.
The distance modulus formula gives us a way to calculate the difference between the apparent and absolute magnitudes of a star:
Distance modulus = 5 * log(distance in parsecs) - 5
For a star that is 11 pc away, the distance modulus is,
Distance modulus = 5 * log(11) - 5 = 1.38
This means that the star's apparent magnitude will be 1.38 magnitudes lower than its absolute magnitude.
If the same star were only 5 pc away from us, the distance modulus would be,
Distance modulus = 5 * log(5) - 5 = 0.38
In this case, the star's apparent magnitude would be only 0.38 magnitudes lower than its absolute magnitude. This means that the star would appear brighter and have a higher apparent magnitude when it is closer to us.
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A concave lens is shown here. According to the model, a lens disperses rays after passing through it. Which item below most likely uses a concave lens to perform its typical function?
The item that most likely uses a concave lens to perform its typical function is a concave lens .
What is a concave lens?A concave lens is a lens that is thinner at the center and thicker at the edges, causing it to diverge parallel rays of light.
How is a concave lens used in a camera?A concave lens is used in a camera to allow the photographer to adjust the focus of the camera by moving the lens closer to or farther away from the film or sensor. When the lens is moved closer to the film or sensor, it increases the distance between the lens and the object being photographed, causing the image to appear larger and bringing objects into focus that were previously blurry.
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if the protons are both released from rest at the closer distance in part a, how fast are they moving when they reach their original separation?
v_max = √(2kq1q2 / (md))
To determine the speed of the protons when they reach their original separation after being released from rest at the closer distance, we can use the principle of conservation of mechanical energy.
According to the given problem, the protons are initially at rest at a closer distance. This means they have zero initial kinetic energy (KE) and only potential energy (PE) due to their separation.
As they move towards each other under the influence of electrostatic force, their potential energy is converted into kinetic energy.
At the original separation, the protons would have reached their maximum kinetic energy, as all of the potential energy would have been converted into kinetic energy. Let's denote this maximum kinetic energy as KE_max.
The total mechanical energy (E) of the protons, which is the sum of their kinetic energy and potential energy, remains constant throughout their motion. So we have:
E = KE + PE
At the original separation, KE = KE_max and PE = 0, as the protons have zero potential energy at that point.
So we can write:
E = KE_max + 0
E = KE_max
Now, let's denote the speed of the protons at the original separation as v_max. We can use the formula for kinetic energy:
KE = 1/2 mv^2
where m is the mass of the proton and v is its speed. Substituting KE_max for E and v_max for v, we have:
KE_max = 1/2 m v_max^2
Since the protons have no initial kinetic energy, their total mechanical energy E is equal to their initial potential energy PE, which is given by the equation:
PE = kq1q2 / d
where k is the electrostatic constant, q1 and q2 are the charges of the protons, and d is their initial separation (closer distance in part a).
Now, if we equate the expressions for KE_max and PE, we get:
1/2 m v_max^2 = kq1q2 / d
Solving for v_max, we have:
v_max = √(2kq1q2 / (md))
where √ denotes the square root.
So, to find the speed of the protons when they reach their original separation, you would need to know the values of the electrostatic constant (k), the charges of the protons (q1 and q2), the mass of the proton (m), and the initial separation (d), and then plug these values into the equation above to calculate v_max.
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jasmin, a cyclist, accelerates from rest. after 8 s, the wheels have made 3 revolutions. (a) what is the angular acceleration of the wheels? (b) what is the angular velocity of the wheels after 8 s?
a. The angular acceleration of the wheels is 0.2945 rad/s². b. The angular velocity of the wheels after 8 seconds is 2.3560 rad/s.
Calculation:
a. The formula for angular acceleration is: α = (ω2 - ω1) / (t2 - t1) Whereα is angular acceleration, ω2 is final angular velocity, ω1 is initial angular velocity, t2 is final time, t1 is initial time. To calculate the angular acceleration, we can use the formula:α = (ω2 - ω1) / (t2 - t1)
The initial angular velocity of the wheels is zero since Jasmin starts from rest, soω1 = 0. We know that the wheels make 3 revolutions after 8 seconds, so the final angular velocity can be calculated as follows: ω2 = (3 revolutions / 8 s) x (2π radians / 1 revolution) = 2.3562 rad/s
Therefore,α = (2.3562 rad/s - 0 rad/s) / (8 s - 0 s) = 0.2945 rad/s². The angular acceleration of the wheels is 0.2945 rad/s².
b. To calculate the angular velocity of the wheels after 8 seconds, we can use the formula:ω = ω1 + αtWhereω is angular velocity,ω1 is initial angular velocity,α is angular acceleration, t is time. The initial angular velocity of the wheels is zero since Jasmin starts from rest, so ω1 = 0
We have already calculated the angular acceleration to be 0.2945 rad/s², and we know that the time is 8 seconds, soω = ω1 + αt = 0 + (0.2945 rad/s²) x (8 s) = 2.3560 rad/s. Therefore, the angular velocity of the wheels after 8 seconds is 2.3560 rad/s.
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a firefighter of mass 30 kg slides down a vertical pole with an acceleration of 5m/s^2. what is the net force acting on him?
The net force acting on the firefighter is 30 kg × 9.8 m/s2 + 4.8 m/s2 = 148 N.
The net force acting on the firefighter of mass 30 kg is the sum of all forces acting on him,
which is equal to the mass of the firefighter multiplied by the acceleration due to gravity plus the frictional force between the pole and the firefighter.
The net force on the firefighter can be calculated using the following equation:
Net force = mass × acceleration due to gravity + frictional force
Net force = 30 kg × 9.8 m/s2 + frictional force
Since the firefighter is accelerating at 5 m/s2, subtract the frictional force from the acceleration due to gravity (9.8 m/s2):
Frictional force = 9.8 m/s2 - 5 m/s2 = 4.8 m/s2
Therefore, the net force acting on the firefighter is 30 kg × 9.8 m/s2 + 4.8 m/s2 = 148 N.
This net force is made up of the gravitational force of 30 kg × 9.8 m/s2 and the frictional force of 4.8 m/s2.
This frictional force allows the firefighter to move down the pole at an accelerating rate of 5 m/s2. Without this frictional force, the firefighter would not move.
The net force acting on the firefighter is 148 N, which is equal to the mass of the firefighter multiplied by the acceleration due to gravity plus the frictional force between the pole and the firefighter.
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What would you expect the force to be if the distance was 30 meters? How did you come up with your answer?
The force would be 6 Newtons for a distance of 30 metres.
What connection exists between distance and force?A force is defined as any influence that results in a change in an object. Distance is the amount of distance that an object moves over time. A force is applied to an item, and the more force is applied, the farther the thing will move.
What is distance-based force?Action-at-a-distance forces are those that develop even when the two interacting objects are not in close proximity to one another but are nevertheless able to push or pull against one another despite this physical gap.
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a ball with a mass of 0.50kg and a speed of 6 m/s collides perpendicularly with a wall and bounces off with a speed of 4 m/s in the opposite direction. what is the magnitude of the impulse acting on the ball
(C) 5 Ns and Usage J = p are the appropriate choices. J = mvf-mvi J = (0.5)(– 4) – (0.5)(6). (6). A massed item changes its velocity in response to a pulling or pushing action.
A body can change its condition of rest or motion by the application of force, which is an external agent. It is directed and has a volume.
The direction of a body or object's motion is defined by its velocity. Most of the time, speed is a multidimensional number. In its purest form, velocity refers to a vector quantity. The pace at which distance changes is what it is. It is the pace at which displacement is changing.
What are referred to as velocity and speed?
Velocity is the pace and directions of an item's motion, whereas speed is indeed the time rate when an object is travelling along a route.
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" Complete question"
A ball with a mass of 0.50kg and a speed of 6 m/s collides perpendicularly with a wall and bounces off with a speed of 4m/s in the opposite direction. What is the magnitude of the impulse acting on the ball?
(A) 13 J
(B) 1Ns
(C) 5Ns
(D) 2m/s
(E) 10m/s
the same baseball is thrown at an angle of 23 degrees and at a speed of 26.8 m/s. the ball is caught 33.456 m from the thrower. the acceleration of gravity is 9.81 m/ss. how high is the tallest spot in the ball's path?
The highest point in the ball's path is approximately 10.71 meters above the ground.
Horizontal distance = Vx × t
33.456 m = (26.8 m/s) × t
t = 1.25 s
Next, we can use the vertical distance formula to find the maximum height of the ball's path:
Vertical distance = Vy0 × t + 0.5 × a × t²
where Vy0 is the initial vertical velocity, which is given by:
Vy0 = V0 × sin(θ)
θ = 23 degrees
V0 = 26.8 m/s
Substituting these values, we get:
Vertical distance = (26.8 m/s) × sin(23°) × 1.25 s + 0.5 × (9.81 m/s²) × (1.25 s)²
Vertical distance = 10.71 m
Acceleration is a fundamental concept in physics that describes the rate of change of an object's velocity over time. It is defined as the change in velocity divided by the change in time, and is expressed in units of meters per second squared (m/s²).
Acceleration can occur in different ways, such as speeding up or slowing down, changing direction, or a combination of both. A positive acceleration means an object is speeding up, while a negative acceleration means it is slowing down. Acceleration also depends on the mass of the object, with a larger mass requiring a greater force to achieve the same acceleration as a smaller mass.
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Describe the shape of the graph, and explain what it says about the relationship between height and gravitational potential energy.
A doubling of the height will result in a doubling of the gravitational potential energy since the gravitational potential energy of an item is precisely proportional to its height above the zero point.
How do height and gravitational potential relate to one other?The mass and height of an item affect the gravitational potential energy. V = -GM/r is the formula for gravitational potential. U = mgh is the formula for gravitational potential energy.
What connection exists between height and the acceleration of gravity?This is the acceleration brought on by gravity while you are above the earth's surface. Based on the aforementioned calculation, we may conclude that as an object's height increases, the value of g falls until it is zero.
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lo4 pos what advantages does the hubble space telescope (hst) have over ground-based telescopes? list some disadvantages
The Hubble Space Telescope offers clear and stable views of the cosmos without atmospheric distortion but has disadvantages including aging infrastructure, limited sensitivity to certain wavelengths, and difficulty with maintenance.
Advantages of Hubble Space Telescope:
Clearer and more stable view of the cosmos, and its sensitivity to a wider range of light. Not affected by atmospheric distortions.It can see far more clearly than a ground-based telescope.The following are the disadvantages of the Hubble Space Telescope:
Aging infrastructure, which has resulted in frequent maintenance and repairs. Its sensitivity to UV and IR radiation was also limited by its design. Not as easy to maintain as ground-based telescopes. The HST's images are often subject to light pollution, which can make it difficult to see faint objects.While the Hubble Space Telescope has revolutionized astronomy and made many groundbreaking discoveries, it also faces challenges and limitations that must be addressed as new space-based observatories are developed to continue advancing our understanding of the universe.
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a 3.2 hz continuous wave travels on a slinky. if the wavelength is 0.47 m, what is the speed of waves on the slinky (in m/s)?
The wave's speed on the slinky is 1.504 m/s
The speed of the wave on the slinky is 3.2 meters per second. This is calculated by dividing the frequency of the wave (3.2 Hz) by the wavelength of the wave (0.47 m). The speed of the wave on the slinky is an important factor to consider when studying wave motion and behavior on a slinky. The speed of the wave determines how quickly it can move along the slinky, and it will have an effect on the wave's properties, such as its amplitude, frequency, and wavelength.
The wave's speed on the slinky (in m/s) is 1.504 m/s. The slinky's wavelength is 0.47 m. Continuous waves travel at a frequency of 3.2 Hz on the slinky. The following formula can be used to determine the wave speed: Wave speed = Frequency x Wavelength.
The following formula can be used to calculate wave speed in general:
Wave speed = Distance/time
Let us now use the first formula to solve the question:
Wave speed = Frequency x Wavelength
Wave speed = 3.2 Hz x 0.47 m
Wave speed = 1.504 m/s
Therefore, the wave's speed on the slinky is 1.504 m/s.
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at what distance from a converging mirror with a 26 cm focal length should an object be placed so that its image is the same distance from the mirror as the object?
At what distance from a converging mirror with a 26 cm focal length should an object be placed so that its image is the same distance from the object should be placed 52 cm away from the mirror.
The image of the object is formed when light rays from the object intersect at a single point. The distance between this point and the mirror is the same as the distance between the mirror and the object.
This distance is known as the focal length of the mirror.The image is the same distance away from the mirror as the object. In this situation, the mirror is a converging mirror because it has a focal length.
To determine the position of the object, we can use the mirror formula.
1/f = 1/u + 1/v
where f is the focal length of the mirror,
u is the distance of the object from the mirror, and
v is the distance of the image from the mirror.
When u = v, we can substitute u with v in the equation to get
2/f = 1/uu = 2f
To determine the distance from the mirror to the object, we may now substitute the values of f and u.
The distance is equal to twice the focal length of the mirror.
Distance of object = 2(26 cm)Distance of object
= 52 cm.
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a 0.170-kg baseball traveling 30.0 m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 15.0 cm . what was the magnitude of the average force applied by the ball on the glove?
The magnitude of the average force applied by the ball on the glove is 34 N.
The magnitude of the average force applied by the ball on the glove.
This can be done by using the equation for force, F = ma, where F is the force, m is the mass of the object, and a is the acceleration of the object.
The mass of the ball is 0.170 kg, and the acceleration is determined by the change in velocity of the ball and the distance the glove recoils, 15 cm, or 0.15 m.
Therefore, the acceleration of the ball is a = (30.0 m/s - 0 m/s)/(0.15 m) = 200 m/s^2.
Since we have the mass and the acceleration, we can calculate the force with the equation above. F = (0.170 kg)(200 m/s^2) = 34 N. Therefore, the magnitude of the average force applied by the ball on the glove is 34 N.
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compare the above electric field to the electric field of a large parallel plate capacitor with the same voltage and distance between the plates. which one is larger? is this expected? explain.
The electric field due to a point charge will always be greater than that of a parallel plate capacitor.
The electric field due to a point charge is given by the formula E=kq/r². Compare the above electric field to the electric field of a large parallel plate capacitor with the same voltage and distance between the plates.
According to Coulomb's law, the electric field due to a point charge varies inversely with the square of the distance from the charge. The magnitude of the electric field between the plates of a capacitor is uniform and is given by E=V/d (where V is the voltage across the plates and d is the distance between them).
Thus, the electric field between the plates of a capacitor is given by E=V/d. Comparing both electric fields, we get that `E[tex]_{point}[/tex] = E[tex]_{plates}[/tex].
It's expected because the electric field between the plates of a capacitor is uniform, and its magnitude depends on the distance between the plates and the voltage applied.
The electric field due to a point charge, on the other hand, varies inversely with the square of the distance between the charge and the point where we want to measure the field. Therefore, the electric field due to a point charge will always be greater than that of a parallel plate capacitor.
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how does the capacitance of two identical capacitors connected in parallel compare to that of one of the capacitors?
The capacitance of two identical capacitors connected in parallel is double that of one of the capacitors because the equivalent capacitance of two capacitors in parallel is equal to the sum of the individual capacitances.
Therefore, when two identical capacitors are connected in parallel, the total capacitance is twice that of one of the capacitors.
The capacitance of two identical capacitors connected in parallel is equal to the sum of the capacitances of the two individual capacitors. In other words, the capacitance of two capacitors connected in parallel is double the capacitance of one of the capacitors.
Explanation: Capacitance is the amount of electrical charge stored per unit of voltage applied to a conductor. When two capacitors are connected in parallel, the two plates of each capacitor become connected, creating a single plate with twice the area of a single capacitor. This means that the capacitance of two identical capacitors connected in parallel is double the capacitance of one of the capacitors.
Formula: The formula for the capacitance of two capacitors in parallel is given by: Ctotal = C1 + C2, where Ctotal is the total capacitance of the two capacitors connected in parallel and C1 and C2 are the capacitances of the two individual capacitors.
Example: if the capacitance of one capacitor is 10μF, then the total capacitance of two capacitors connected in parallel is 20μF.
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Force exerted by a person or an object is called an ______________________ force.
The force exerted by a person or an object is called an applied force.
What is applied force?When a person or an object exerts force on another object, this force is called an applied force. Applied forces can be exerted in many different ways and can have a variety of effects on the objects they act upon. For example, a person might apply force to push a box across the floor, or an object might apply force to hold a book against a table.
Applied forces can be characterized by their direction, magnitude, and point of application. The direction of an applied force is the direction in which the force is being exerted (such as left, right, up, or down). The magnitude of an applied force is the amount of force being exerted (measured in newtons). The point of application of an applied force is the point at which the force is being exerted on the object.
It is important to note that applied forces can only be exerted on other objects - they cannot be exerted on the object that is doing the exerting. For example, if you push a box across the floor, you are applying a force to the box, not to yourself. This is because forces always occur in pairs - for every action, there is an equal and opposite reaction.
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please help me!!!!! (i beg)
Answer:
A
Explanation:
This is based on the theory by J. J. THOMPSON
a diver jumps off the diving board. he pushes himself downward at a rate of 2 m/s. gravity increases his downward velocity to 6 m/s when he hits tthe water 1.5 seconds later. what is his acceleration?
The diver's acceleration is 2.67 m/s^2.
We can use the formula for acceleration:
a = (vf - vi) / t
where a is acceleration, vf is final velocity, vi is initial velocity, and t is time.
In this problem, the initial velocity (vi) is 2 m/s downward, the final velocity (vf) is 6 m/s downward, and the time (t) is 1.5 seconds.
Plugging in these values, we get:
a = (6 m/s - 2 m/s) / 1.5 s
a = 4 m/s / 1.5 s
a = 2.67 m/s^2
As a result, the acceleration of the diver is 2.67 m/s^2.
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a constant force is applied to an object, causing the object to accelerate at 7.50 m/s2 . what will the acceleration be if the force is doubled and the object's mass is halved?
The acceleration be if the force is doubled and the object's mass is halved when a constant force is applied to an object, causing the object to accelerate at 7.50 m/s² is 30.00 m/s².
Therefore Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. It can be expressed mathematically as follows:
[tex]F=ma[/tex]
where F is the force applied to the object,
m is its mass, and
a is its acceleration.
Given that the initial force on the object causes an acceleration of 7.50 m/s²,
we can write it as
[tex]F = m*a_{1}[/tex]
where F1 is the initial force applied,
[tex]a_{1}[/tex] is the initial acceleration, and
m is the mass of the object.
We can rearrange the terms and write it as
[tex]\frac{F}{m}=a_{1}[/tex]
[tex]\frac{F}{m}=7.50[/tex] m/s²
Now, if the force is doubled and the mass is halved, the equation becomes:
[tex]2F = \frac{1}{2}m[/tex]
where 2F is the new force,
[tex]a_{2}[/tex] is the new acceleration, and
[tex]\frac{1}{2}m[/tex] is the new mass.
We can also write above equation as
[tex](\frac{4F}{m})=a_{2}[/tex]
Substituting the value of [tex]\frac{F}{m}[/tex] as 7.50 m/s²
Simplifying this equation, we can solve for a₂:
[tex]a_{2}=4*a_{1}[/tex]
[tex]a_{2}=4*7.50[/tex]
[tex]a_{2}=30.00[/tex] m/s²
Therefore, if the force is doubled and the object's mass is halved, the acceleration of the object will be four times the initial acceleration, or 30.00 m/s².
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What layer of earth can you see through a open hole?
Answer:
The mantle is exposed in place of Earth’s missing crust.
Explanation:
Suppose you were to compare three stars with the same surface temperature. If star A is a giant star, star B is a supergiant star, and star C is a main sequence star, order the three stars in terms of increasing radius. a. Star C, Star A, Star B b. Star B, Star A, Star C c. Star A, Star C, Star B d. Star B, Star C, Star A
If star A is a giant star, star B is a supergiant star, and star C is a main sequence star, the order of the three stars in terms of increasing radius is Star A, Star C, Star B.
A giant star is a luminous star that is considerably larger and brighter than the sun. The distinction between giant and dwarf stars is primarily determined by their luminosity, and giant stars are more luminous. They are not, however, larger in diameter than dwarf stars. Their size is the outcome of a high luminosity-to-mass ratio.
A supergiant star is a massive star with a luminosity that is many times greater than that of a giant star. As a result, a supergiant star is much larger than a giant star. However, supergiant stars have a similar surface temperature as giant stars.
Sequence stars are stars that spend most of their lives in the primary sequence of stars. A main-sequence star is a star that is in the hydrogen-burning phase of its evolution. It is in a state of hydrostatic equilibrium, meaning that the gravitational force holding the star together is balanced by the pressure generated by the thermonuclear fusion taking place in its core.
The stars will have the following order in terms of increasing radius: Star A, Star C, Star B if star A is a giant star, star B is a supergiant star, and star C is a main sequence star, and they all have the same surface temperature.
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the electric motor of a model train accelerates the train from rest to 0.700 m/s in 31.0 ms. the total mass of the train is 505 g. find the average power delivered to the train during its acceleration.
The average power delivered to the train during its acceleration is 0.134 W.
The average power delivered to the train during its acceleration can be calculated using the equation P = Fv/t. The total mass of the train is 505 g, which can be converted to kilograms by multiplying by 0.001. The time it takes for the train to accelerate is 31.0 ms, which can be converted to seconds by dividing by 1000. The velocity of the train is 0.700 m/s. Using these values, the average power delivered to the train can be calculated as:
P = (505g*0.001 kg/g) * (0.700 m/s/ (31.0ms/1000s))
P = 0.134 W
The average power delivered to the train is 0.134 W. This calculation shows that the electric motor was able to deliver enough power to accelerate the train from rest to 0.700 m/s in 31.0 ms.
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a skateboarder jumps on a moving skateboard from the side. does the skateboard slowdown or speed up in this process?
When a skateboarder jumps on a moving skateboard from the side, the skateboard will slow down in this process. The law of conservation of momentum.
According to the law of conservation of momentum, the total momentum of a closed system remains constant if no external forces act on it. So, in this scenario, the initial momentum of the skateboarder and the skateboard moving at a certain speed in one direction is equal to the momentum of the skateboarder and the skateboard moving at a slower speed in the same direction.
This means that the momentum of the skateboarder and the skateboard should be equal in magnitude but opposite in direction to the momentum of the skateboard before the skateboarder jumps on. When the skateboarder jumps on a moving skateboard, the skateboard's momentum changes as the skateboarder's mass is added to it.
Since the law of conservation of momentum applies, the momentum gained by the skateboarder and the skateboard is equal to the momentum lost by the skateboard.
As a result, the skateboard's speed decreases when the skateboarder jumps on.
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water flows with constant speed through a garden hose that goes up a step 20.0 cm high. if the water pressure is 143 kpa at the bottom of the step, what is its pressure at the top of the step?
The pressure at the top of the step is 339 kPa.
We can use the principle of conservation of energy to solve this problem. The total energy of the water at any point along the hose can be expressed as the sum of its potential energy and kinetic energy. Since the water flows with constant speed, its kinetic energy remains constant throughout the hose. Thus, any change in energy must be due to a change in potential energy.
At the bottom of the step, the pressure is given as P1 = 143 kPa. Let's assume that the cross-sectional area of the hose remains constant throughout, so that the volume of water flowing per unit time remains constant as well. Let V be the volume of water flowing per unit time, and let A be the cross-sectional area of the hose. Then, the speed of the water is given by v = V/A.
As the water flows up the step, it gains potential energy due to its increase in height. The increase in potential energy per unit volume of water is given by the product of the height difference and the density of water (ρ = 1000 kg/m³) multiplied by the gravitational acceleration (g = 9.8 m/s²): ΔU/V = ρgh.
Let P2 be the pressure at the top of the step, and let h = 0.2 m be the height of the step. Then, the pressure difference between the top and bottom of the step is given by ΔP = P2 - P1, and the change in potential energy per unit volume of water is ΔU/V = ρgh. Therefore, using the principle of conservation of energy, we have:
1/2 ρv² + P1 = 1/2 ρv² + P2 + ρgh
Simplifying and solving for P2, we get:
P2 = P1 + ρgh
Plugging in the given values, we get:
P2 = 143 kPa + (1000 kg/m³)(9.8 m/s²)(0.2 m) = 143 kPa + 196 kPa = 339 kPa
Therefore, the pressure is 339 kPa.
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a girl at a skate park starts at rest, at the top of a 33 meter-high hill. how fast is she traveling when she reaches the top of the second hill, only 5 meters high? (assume no friction loss.)
She traveling when she reaches the top of the second hill, only 5 meters high is 17.71m/s fast.
Given:
u=0 at A
h_1=27m
v=? at B
h2=11m
Apply law of conservation of energy; at A & B;
[tex]1 / 2mu^2 + mgh_1 = 1 / 2 mv^2 + mgh_2\\mgh_1 = 1/2mv^2 + mgh_2\\2gh_1 = v^2 + 2gh^2\\v^2 = 2g(h_1 - h_2)\\v=\sqrt{2*9.8[27-11]}\\[/tex]
v = 17.71m/s
Friction is a fundamental phenomenon that arises whenever there is contact between two surfaces, and it is an essential aspect of our everyday lives. The origin of friction lies in the intermolecular forces that exist between the atoms and molecules that make up the surfaces in contact.
When two surfaces come into contact, these intermolecular forces create a resistance to the relative motion of the surfaces. This resistance manifests as a force that opposes the direction of motion, and it is known as friction. Friction can be both beneficial and detrimental. On one hand, it allows us to walk, drive, and manipulate objects. On the other hand, it can cause wear and tear on machinery and create unwanted heat, which can be wasteful and even dangerous.
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you are standing on a scale in an elevator. suddenly you notice your weight increases. what do you conclude?
When standing on a scale in an elevator, if one notices an increase in their weight, it means that: the elevator is accelerating upwards.
This is due to the fact that the scale underfoot has to counter the upward acceleration of the elevator, which causes the weight measured on the scale to increase. The scale measures the normal force, which is the weight being exerted on the scale, which is equal to the mass of the individual multiplied by the gravitational acceleration on the surface of the earth.
This can be represented by the formula: W = mg,
where W is the weight, m is the mass of the object and g is the gravitational acceleration.
When the elevator is stationary or moving at a constant velocity, the gravitational acceleration is the same as the normal force and the weight of the individual remains constant. However, when the elevator begins to accelerate upwards, the normal force exerted by the scale must increase to counter the upward acceleration of the elevator.
This causes an increase in weight measured on the scale. Therefore, if one notices an increase in their weight while standing on a scale in an elevator, it indicates that the elevator is accelerating upwards.
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