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Answer updated on: 25 Jul 2019

Opposite in direction to the frictional force exerted on the merry-go-round by the person

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The rope actually pulls you up

When you pull down on the rope, the rope pulls up on you!! It is actually this upward force by the rope that makes you move up! This is the reaction force (by the rope on you) to the force that you exerted on the rope. And voilá, this is Newtons 3rd Law.

When you pull down on the rope, the rope pulls up on you!! It is actually this upward force by the rope that makes you move up! This is the reaction force (by the rope on you) to the force that you exerted on the rope. And voilá, this is Newtons 3rd Law.

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Answer updated on: 30 May 2019

Yes

Gravitational PE is mgh, where height h is measured relative to some arbitrary reference level where PE = 0. For example, a book on a table has positive PE if the zero reference level is chosen to be the floor. However, if the ceiling is the zero level, then the book has negative PE on the table. It is only differences (or changes) in PE that have any physical meaning.

Gravitational PE is mgh, where height h is measured relative to some arbitrary reference level where PE = 0. For example, a book on a table has positive PE if the zero reference level is chosen to be the floor. However, if the ceiling is the zero level, then the book has negative PE on the table. It is only differences (or changes) in PE that have any physical meaning.

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Answer updated on: 30 May 2019

No

Work = Fd. Work requires that a force acts over a distance. If an object does not move at all, there is no displacement, and therefore no work done.

Work = Fd. Work requires that a force acts over a distance. If an object does not move at all, there is no displacement, and therefore no work done.

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It has more kinetic energy than the gun

While it is true that the magnitudes of the momenta of the gun and the bullet are equal, the bullet is less massive and so it has a much higher velocity. Since KE is related to v2, the bullet has considerably more KE and therefore can do more damage on impact.

While it is true that the magnitudes of the momenta of the gun and the bullet are equal, the bullet is less massive and so it has a much higher velocity. Since KE is related to v2, the bullet has considerably more KE and therefore can do more damage on impact.

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18 m/s

The initial momentum is zero, so the momenta of Amy and Gwen must be equal and opposite. Since p = mv, then if Amy has 3 times more mass, we see that Gwen must have 3 times more speed.

The initial momentum is zero, so the momenta of Amy and Gwen must be equal and opposite. Since p = mv, then if Amy has 3 times more mass, we see that Gwen must have 3 times more speed.

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Answer updated on: 30 May 2019

4 times the work

The elastic potential energy is 1/2 kx2. So in the second case, the elastic PE is 4 times greater than in the first case. Thus, the work required to stretch the spring is also 4 times greater.

The elastic potential energy is 1/2 kx2. So in the second case, the elastic PE is 4 times greater than in the first case. Thus, the work required to stretch the spring is also 4 times greater.

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Answer updated on: 05 Apr 2019

Zero

If its isothermal theres no change in temperature. if theres no change in temperature theres no change in internal energy.

If its isothermal theres no change in temperature. if theres no change in temperature theres no change in internal energy.

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Yes! But very unlikely.

Remember the bullets vertical velocity goes to zero before it starts to return to earth. If this is happening around the height of the plane the pilot could grab it. This would of course take lots of luck and extraordinary timing. But still physically possible.

Remember the bullets vertical velocity goes to zero before it starts to return to earth. If this is happening around the height of the plane the pilot could grab it. This would of course take lots of luck and extraordinary timing. But still physically possible.

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Asked on: 03 Jul 2019

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