# Chapter 5: Circular Motion and Gravity - PowerPoint PPT Presentation

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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..

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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

### As a satellite falls into a lower orbit, its speed

• decreases.

• is unchanged.

• increases.

• depends on the mass of the satellites.

• cannot be determined.

### As a satellite falls into a lower orbit, its speed

• decreases.

• is unchanged.

• increases.

• depends on the mass of the satellites.

• cannot be determined.

### Which of the following statements is one of Kepler's three laws of planetary motion?

• 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

### Which of the following statements is one of Kepler's three laws of planetary motion?

• 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

• 1

• 2

• 3

• 4

• 5

### Of the satellites shown revolving around Earth, the one with the greatest speed is

• 1

• 2

• 3

• 4

• 5

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