Correct option is A) The objects always attract each other.
There is always a pull from gravity. It won't repel.
A mass attracts a mass; the amount of the gravitational force is directly proportional to the masses of the two items and inversely proportional to the square of the distance between the two objects. Gravitational force is an attractive force that exists between all objects with mass.
A rise in one quantity causes a fall in the value of the other since the two values are inversely proportionate. In other words, as the separation distance increases, the force of gravity decreases, and as the separation distance decreases, the force of gravity increases.
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Which of the following graphs best illustrates how the intensity of sound varies as a detector is moved further and further from a stationary source projecting sound in all directions
The graph that best illustrates how the intensity of sound varies as a detector is moved further and further from a stationary source projecting sound in all directions would be an inverse square law graph. This graph would show that the intensity of sound decreases as the distance from the source increases. The intensity of sound is inversely proportional to the square of the distance from the source.
This means that if the distance from the source is doubled, the intensity of sound is decreased by a factor of four. This relationship is commonly observed in physics and engineering and is known as the inverse square law of sound propagation. This law states that the intensity of sound decreases as the distance from the source increases in a manner that is inversely proportional to the square of the distance.
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a skier of mass m starts from rest at the top of a solid sphere of radius r and slides down its frictionless surface. (a) aat what angle will the skier leave the sphere? (b) if friction were present, would the skier fl off at a freater or lesser angle?
A skier of mass m starts from rest at the top of a solid sphere of radius r and slides down its frictionless surface.
The net force on the skier in the radial direction must be equal to the centripetal force in order to sustain circular motion.
[tex]$F_{\mathrm{radial}}=\frac{m v^2}{r}$[/tex]where [tex]v[/tex] denotes the skier's tangential instantaneous speed. Gravity and the normal force are the two forces at work on the skier. While the gravitational force is constantly radially outward, the normal force is always dependent on the angle [tex]\theta[/tex]. Therefore, the net force in the radial direction is, if the skier is at an angle of [tex]\theta[/tex] down the sphere.
[tex]$F_{\text {radial }}=m g \cos \theta-N$[/tex]
where N is the normal force's magnitude. When these two equations are combined, we get,
[tex]$\frac{m v^2}{r}=m g \cos \theta-N$[/tex]
Using the principle of energy conservation, we now substitute v with values we already know. The loss of potential energy equals the increase in kinetic energy, which on a sphere is written as,
[tex]$\frac{1}{2} m v^2=m g r(1-\cos \theta)$[/tex]
As the skier begins at rest, there is no kinetic energy at the top of the sphere. After removing [tex]v^2[/tex], we are left with the equation,
[tex]$2 m g(1-\cos \theta)=m g \cos \theta-N$[/tex]
Quantifying the situation when the skier exits the sphere is the last aspect of the issue. We can see that when theta equals 0, we get N = mg, which means that the normal force acting on the skier precisely balances the force of gravity. N decreases as the skier descends the sphere's surface, balancing the equation until it equals zero at a certain angle. This occurs precisely when,
[tex]$2 m g(1-\cos \theta)=m g \cos \theta$[/tex]
The skier is no longer in contact with the sphere when the normal force acting on the skier is zero, as the sphere no longer exerts any force on the skier. This is assumed to be the prerequisite for the skier to leave the ground.
After calculating [tex]\theta[/tex], we have,
[tex]$2 m g=3 m g \cos \theta$[/tex]
[tex]$\Longrightarrow \theta=\cos ^{-1}(2 / 3) \approx 48.19^{\circ}$[/tex]
First, we can note that this response is unaffected by the physical parameters m, r, and g. No matter how heavy he is, how huge the sphere is, or how powerful gravity is, the skier will exit the sphere at the same angle.
However, we will discover from dimensional analysis that this independence is actually not all that remarkable. Consider the units of the variables we've provided,
[tex]$[m]=$ kilograms,$\quad[r]=$ meters,$\quad[g]=$ meters $\cdot$ seconds $^{-2}$[/tex]
Any algebraic statement containing m, r, and g cannot be transformed into a dimensionless quantity. As a result, we draw the conclusion that the solution to our problem cannot depend on these values as an angle is a dimensionless quantity.
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J
If a building is 17 m tall, how long would it take to hit the ground?
It would take approximately 0.45 seconds for a 17 m tall building to hit the ground.
What is distance?
Distance is the amount of space between two objects or points. It is measured in units such as meters, feet, or miles. Distance can also refer to the length of time it takes for something to happen, such as the distance between two events.
This is calculated by using the formula: time = (distance)/(gravity x 2). In this case, distance is 17m and gravity is 9.8 m/s2, so time = (17 m)/(9.8 m/s2 x 2) = 0.45 seconds.
Distance may also refer to the emotional or physical separation between two people or groups. Distance can be expressed as a physical, mental, or emotional concept.
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Suppose you have a light spring stretched out and one end is attached to a wall. With this setup, you can move the free end in any of three directions (x,y, z). The spring lies along the z axis.
Which type of wave do you create when you move the free end along the z axis?
Which type of wave do you create when you move the free end along the x axis?
Which type of wave do you create when you move the free end along the y axis?
CHoose one for each.
transverse
longitudinal
When you move a stretched out light spring one end attached to a wall lying in z-axis along z-axis, you get a longitudinal wave and when along x-axis or y-axis, you get a transverse wave.
When you move the free end of the spring along the z axis (the axis along which the spring is stretched), you create a longitudinal wave. This is because the displacement of the spring particles is in the same direction as the direction of wave propagation.
When you move the free end of the spring along the x axis, you create a transverse wave. This is because the displacement of the spring particles is perpendicular to the direction of wave propagation.
When you move the free end of the spring along the y axis, you create a transverse wave. Similarly to x axis, the displacement of the spring particles is perpendicular to the direction of wave propagation.
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To find the acceleration of a glider moving down a sloping air track, you measure its velocities (V1 and V2) at two points and the time t it takes between them, as follows:V1=0. 21+/- 0. 05m/s, V2=0. 85 +/- 0. 05m/s, t=8. 0 +/- 0. 1sa) Assuming all uncertainties are independent and random, find the average acceleration, a=(v2-v1)/t , and its uncertainty. B) How well does your result in part (a) agree with your friends theoretical prediction that a=0. 13 +/- 0. 01m/s^2
0.08 m/s2 is the average acceleration. The acceleration's degree of uncertainty is 0.0135 m/s2.
Describe acceleration.Accelerations are included in vector quantities. An object's acceleration in relation to a net force is determined by the direction of that force. Force imbalances lead to acceleration in a body.
Uniform, non-uniform, and average acceleration are the three primary types of accelerated motions. It is said to have uniform acceleration when an object moves in a straight line with an increase in speed that happens at regular intervals of time.
Acceleration is the term used to describe any change in the speed or direction of a motion. Anything that is accelerating is moving faster, slower, or in a direction other than straight forward.
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In which of the following sport the turning effect of force used
a) swimming b) tennis c) cycling d) hockey
The turning effect of force used in cycling. Hence, option (c) is correct.
What is turning effect of force?The moment is the term for turning effect of a force. It is the result of multiplying the force by the perpendicular distance from the force's line of action to the pivot point or location where the object will turn.
If a body that is being affected by a net external force is allowed to revolve around a pivot, the body will typically turn in the force's direction.
When a cycle paddled, force is applied for revolving it. That is why, the turning effect of force used in cycling.
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Does thermal energy increase or decrease during melting?
Thermal energy increases during melting.
When ice melts during melting, its temperature remains constant until all the ice turns into water. Then, heating of liquid water causes the molecules to vibrate faster and steadily increasing the temperature.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A branch of physics, thermodynamics, concerns with how heat is transferred among different systems.
An example of thermal energy is boiling water on a stove. When boiling water, thermal energy is produced when the atoms and molecules in a substance vibrate faster because of raising in temperature.
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at the top of a pole vault, an athelete actually can do work pushing on the pole before releasing it. suppose the pushing force that the pole ecerts back on the athelete is given by F(x)=(1.5*10^2N/m)x-(1.9*10^2N/m^2)x2 acting over a distance of 0.20m. how much work is done on the athelete?
2.49 Joules have been performed on the athlete, in accordance with the provided statement.
What in science is a force?In science, the word "force" has a concrete meaning. At this point, referring to a force as a push or simply a yank is perfectly appropriate. An constituent does not "have in it" or "contain" a factor. A force is felt by one entity coming from another. The idea of a force encompasses both living and non-living entities.
You must incorporate the work expression because it is a vital part of Fdx.
Gained is
W = integral of ( 150x - 190 x 2 ) dx
= 75 x2 - 63.333 x3
So now...
work done = 75 *0.202 - 63.333 *0.203 = 2.49Joules
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Developing a Strategy
Now that you have an obstacle in mind, take another few minutes and think about which success strategy might best help you overcome this obstacle. Write this strategy in the box below:
Explanation:
Look at your resources around you, find ways to cope with the situation.
Look at your environment or what is there around you that can help you.
Is there anyone that can help you.
Think more.
Try thinking outside of the box
Don't be logical
I wasn't sure if you meant this mentally or physically.
A 12 kg barrel is pulled up by a rope. The barrel accelerates at . Find the force exerted by the rope. Show all your work.
The solution is 14.4 N
Steps:
The given values are:
mass
m=12kg
Acceleration
a=1.2m/s²
As we know te formula
⇒force=mass×acceleration
By substituting the values we get,
⇒1.2×1.2
⇒14.4N
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why are ventilations for a room put near the roof and not near the floor
Answer:
Ventilators are provided near ceilings in the rooms of our houses because the hot air is lighter and rises out of the room through the ventilators. Cool fresh air rushes into the room through the doors and windows to occupy its place.
Please help if you have the time
A string is stretched between fixed supports 2.0 meters apart. When set in transverse vibration at a frequency of 120 Hz the string vibrates in four segments, as shown. What is the wave speed in the string?
We know, length of segment wave is half the wavelength .
Let, wavelength of wave is [tex]\lambda[/tex].
So, length of segment will be [tex]\dfrac{\lambda}{2}[/tex] .
Now, it is given that the string vibrates in four segments.
So,
[tex]L = 4\times \dfrac{\lambda}{2}\\\\L = 2\lambda\\\\\lambda = 1\ m[/tex]
Speed can be given by :
[tex]speed = wavelength \times frequency\\\\speed = 1\times 120\ m/s\\\\speed = 120\ m/s[/tex]
Therefore, the wave speed in the string is 120 m/s.
As the number of resistors in a parallel circuit is increased, what happens to the
equivalent resistance of the circuit and total current in the circuit?
Answer:
resistance- decreases current-increases
the number of turns in primary coil and secondary coil of transformer never made equal, why??
plz give yr own answer..
Answer:
the number of turns in primary coil and secondary coil of transformer never made equal because if we do so there would not be any use of using transformers. same current will be gain.
Actually transformers are use to increase or decrease voltage.
Explanation:
The number of turns in primary coil and secondary coil of transformer never made equal because if we made equal there will run equal voltage of current and there will not be the any use of secondary coil of transformer in the comparison to primary coil .As different transformers are used to increase or decrease the voltage of current.
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If the human body has an average density of 981 kg/m3 , what fraction of a person is submerged when floating gently in fresh water
The fraction of the person submerged in fresh water is about 98.1%.
Given data as per the question:
Average density of the human body= 981 kg/ m³.
The Law of floatation can be defined as the volume of the liquid displaced when a body floats on the liquid surface is equal to the body submerged in the water.
As body has the stable equilibrium state, the buoyancy of the fluid will be equal to the weight.
Weight of the body floating = Weight of the body immersed in fluid
Law of floatation = Density of the floating object / density of fluid
As fluid is the freshwater here, the density of fluid will be 1000 kg/ m³.
= (981 kg/ m³) / ( 1000 kg/ m³)
= 98.1 %
A person is submerged when floating gently in fresh water about 98.1%.
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2.71 m and 4.4 m long and have masses of 69.5 kg and 100 kg, respectively. Calculate the total rotational kinetic energy of the two hands about the axis of rotation. Model the hands as lon
Answer:
1.04 x 10-3 J.
Explanation:
The total rotational kinetic energy of the two hands about the axis of rotation is calculated using the formula:
Kinetic Energy = 1/2 I ω2,
where I is the moment of inertia and ω is the angular velocity.
For this scenario, the moment of inertia is calculated by
I = 1/3 ML2,
where M is the total mass and L is the length of the arm.
Since the total mass of the two hands is 169.5 kg, and the length of the arms is 2.71 m and 4.4 m, the moment of inertia is calculated to be I = 5.35 x 10-5 kg m2. Substituting this value of I into the equation, the total rotational kinetic energy of the two hands about the axis of rotation is calculated to be 1.04 x 10-3 J.
A can, containing only air, has its lid tightly screwed on and is left in strong sunlight
i) State what happens to the pressure of the air in the can when it gets hot
ii) In terms of molecules, explain your answer to b i.
Answer:
Because everyone knows that when you increase temperature activity withn molecules increases they will collide more making the can probably explode
If you are going the same speed, the greater the vehicle _______ the greater the force of impact. florida
If you are going the same speed, the greater the vehicle, the greater the force of impact on the reacting body and greater the inertia of it and greater is its velocity.
Velocity of any body is the speed by which it is travelling along with the direction it has given. velocity is a vector quantity because it has both magnitude and direction. velocity has both magnitude and direction so it different from speed but its magnitude is same as that of speed and we can calculate both as their magnitude are equal. velocity is the measure of the speed of the moving body by which it is moving in the place from one place to another. velocity and speed are the same but they are different in the essence in the form of their type. speed is scalar and velocity is vector. by this primary information we can consider that primarily that if you are going the same speed, the greater the vehicle, the greater the force of impact on the reacting body and greater the inertia of it and greater is its velocity.
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Which would be eaier to carry --- a chool bag with a broad trap for a chool bag with a very thin trap?
Jutify your anwer
A school bag with a broad strap would be easier to carry when compared with a school bag with thin strap.
Bags are used to carry loads. There are bags with two straps and bags with one strap. Bags with one strap spread lesser area for carrying whereas bags with two straps spread more area.
The school bags with broad straps are easier to handle. This is due to the reason that the load of the bag is distributed over larger area, thereby decreasing the pressure on the shoulders. The pressure provided by smaller straps is higher ans causes irritation.
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Answer:
what
Explanation:
Which statement about a turtle's energy source is true?
Responses
A. A turtle performs photosynthesis to gain its energy.
B. Nutrients in the water are the ultimate source of energy for a turtle
C. A turtle relies indirectly on the sun as an energy source.
Answer:
C. A turtle relies indirectly on the Sun as an energy source.
Explanation:
Turtles are animals, meaning they are unable to perform photosynthesis, thus option A is inapplicable. Turtles consume food such as algae and seagrass. These aquatic plants gain their energy directly from the Sun through photosynthesis, and as a result when the turtle consumes these plants, that energy from the Sun is indirectly feeding the turtle.
A skier is pushed from the top of a hill so that he starts moving down the hillside from a height of 100 m with
an initial speed of 0.434 m/s. After traveling 80.4 m, he reaches the bottom of the valley. Due to inertia, he
then continues 70.4 m up another hillside (y = 40 m) and crashes into a snow bank that compressess like a
spring (k = 50 N/m). What is the skiers speed as he crashes into the snow bank? How far does the snow
compress? Assume that you can neglect friction.
Speed as the skier crashes into the snow bank: 0.434 m/s
Distance the snow compresses: 1.544 m
The speed of the skier as he crashes into the snow bank is the initial speed since there is no acceleration due to the lack of friction. The distance the snow compresses is calculated using the following equation:
compression = (mass x velocity2) / (2 x spring constant)
Therefore, compression = (75 kg x 0.4342) / (2 x 50 N/m) = 1.544 m
5kg
P= 210 N
[2]
2 kg
3 kg
5 kg
P = 210 N
M = 0.2
141
1 kg
Answer:
2
Explanation:
ate kinus to plis ffffg
A elastic spring is compressed by an amount x. Show that its P.E. is 1/2 kx2
where k is the spring constant.
Answer:
The potential energy (P.E.) stored in an elastic spring is equal to the work done in compressing or stretching the spring.
When a spring is compressed or stretched, the force required to do so is given by Hooke's law, which states that the force F required to compress or stretch a spring by an amount x is given by
F = kx, where k is the spring constant.
The work done in compressing or stretching a spring is equal to the force required to do so multiplied by the distance over which the force is applied.
In the case of a spring, this distance is equal to the amount x by which the spring is compressed or stretched.
Therefore, the work done in compressing or stretching a spring is given by
W = Fd = kx * x = kx^2.
The potential energy stored in the spring is equal to the work done to compress or stretch it.
Therefore, the potential energy of a spring that is compressed by an amount x is given by P.E. = W = kx^2.
Substituting kx^2 = 1/2 kx^2, we find that
P.E. = 1/2 kx^2.
This shows that the potential energy stored in an elastic spring is equal to 1/2 times the spring constant multiplied by the amount x by which the spring is compressed or stretched.
Explanation:
HELPP WITH THESE QUESTIONS PLEASEEE!!
A 3.00kg mass is attached to an ideal spring with k =200N/m ,if the velocity of the body at 0.25 is 2.3m/s find the amplitude and maximum velocity
Answer:
To solve this problem, you can use the following formula:
v = sqrt(k / m) * A
In this formula, v is the velocity of the mass, k is the spring constant, m is the mass of the object, and A is the amplitude of the oscillation.
Since you know the velocity of the mass at 0.25 seconds, you can substitute this value into the formula and solve for A:
2.3 m/s = sqrt(200 N/m / 3.00 kg) * A
A = 2.3 m/s / sqrt(200 N/m / 3.00 kg)
= 0.23 m
So, the amplitude of the oscillation is approximately 0.23 meters.
To find the maximum velocity of the mass, you can substitute the values for k, m, and A into the formula for velocity:
v = sqrt(200 N/m / 3.00 kg) * 0.23 m
= 2.75 m/s
So, the maximum velocity of the mass is approximately 2.75 m/s.
convert 67kelvin to degrees celcius
67 kelvin is -206.15 celcius
HELP ILL MARK BRAINLIEST!!
Match these items words on the left with the statement that best describes it.
force
1. force used to generate electricity
muscular
2. the force that attracts any object to another
3. a push or a pull action
water
4. a property of all matter at work
gravity
5. force used to walk up the steps
newton-meter
6. English measurement of work
foot-pound
7. the metric measurement of work
motion
the force that attract any object to another =gravity
Throw a paper ball towards a hard wall. a) Did the wall apply force on the ball? If yes, then what is the name of the force? b) What are the effects of the force applied by the wal
Answer:
Reaction force
Explanation:
A ball is thrown against a wall: The ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off
1. There are only two factors that affect your environment. (1 point)
O True
OFalse
2. Seasonal changes impact the environment. (1 point)
True
OFalse
3. Plants in a room can actually improve air quality. (1 point)
O True
OFalse
4. Scientists are not concerned with the human impact on the environment.
True
OFalse
5. Land environments are different than water environments. (1 point)
True
False
(1 point)
Seasonal changes impact the environment. is There are only two factors that affect your environment.
What is seasonal behavior?Seasonal affective disorder, a clinically diagnosed syndrome, is believed to represent the morbid extreme of a spectrum of seasonality. Two types of seasonality have been clinically described: one characterized by a winter pattern and a second by a summer pattern of depressive mood disturbance.
Does seasonal mean every year?Seasonality is a characteristic of a time series in which the data experiences regular and predictable changes that recur every calendar year. Any predictable fluctuation or pattern that recurs or repeats over a one-year period is said to be seasonal.
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