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Chapter 5: Circular Motion and Gravity

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Chapter 5: Circular Motion and Gravity

A ball is whirled in a horizontal circle of radius r and speed v. The radius is increased to 2r keeping the speed of the ball constant. The period of the ball changes by a factor of

- one half.
- one.
- two.
- three.
- four.

A ball is whirled in a horizontal circle of radius r and speed v. The radius is increased to 2r keeping the speed of the ball constant. The period of the ball changes by a factor of

- one half.
- one.
- two.
- three.
- four.

The figure shows the position of a ball as it is being whirled in a vertical circle. At point (a), the direction of the centripetal acceleration is

The figure shows the position of a ball as it is being whirled in a vertical circle. At point (a), the direction of the centripetal acceleration is

Suppose a planet exists that has half the mass of earth and half its radius. On the surface of that planet, the acceleration due to gravity is

- twice that on Earth.
- the same as that on Earth.
- half that on Earth.
- one-fourth that on Earth.
- none of these.

Suppose a planet exists that has half the mass of earth and half its radius. On the surface of that planet, the acceleration due to gravity is

- twice that on Earth.
- the same as that on Earth.
- half that on Earth.
- one-fourth that on Earth.
- none of these.

- R = Gv/M
- R = Gv/mM
- R = GmM/v
- R = GM/mv
- R = GM/v2

- R = Gv/M
- R = Gv/mM
- R = GmM/v
- R = GM/mv
- R = GM/v2

- decreases.
- is unchanged.
- increases.
- depends on the mass of the satellites.
- cannot be determined.

- decreases.
- is unchanged.
- increases.
- depends on the mass of the satellites.
- cannot be determined.

- A line joining any planet to the sun sweeps out equal areas in equal times.
- Only an odd number of planets can orbit the sun.
- The period of any planet about the sun is proportional to the planet's distance from the sun.
- All planets move in elliptical orbits with the earth at one focus.
- F = GMm/R2

- A line joining any planet to the sun sweeps out equal areas in equal times.
- Only an odd number of planets can orbit the sun.
- The period of any planet about the sun is proportional to the planet's distance from the sun.
- All planets move in elliptical orbits with the earth at one focus.
- F = GMm/R2

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- 2
- 3
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- 5

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Five masses are in orbit around a central mass. A is a distance R from the center, B is at 2R, C is at 3R, D at 4R and E is at 5R. Which planet has the longest period of revolution?

Five masses are in orbit around a central mass. A is a distance R from the center, B is at 2R, C is at 3R, D at 4R and E is at 5R. Which planet has the longest period of revolution?

- less than
- equal to
- greater than

- less than
- equal to
- greater than