Chapter 5: Circular Motion and Gravity

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

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

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.
The radius R of a stable, circular orbit for a satellite of mass m and velocity v about a planet of mass M is given by
• R = Gv/M
• R = Gv/mM
• R = GmM/v
• R = GM/mv
• R = GM/v2
The radius R of a stable, circular orbit for a satellite of mass m and velocity v about a planet of mass M is given by
• 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

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?

A planet is orbiting a star in an elliptical orbit as shown. The speed of the planet when it is at A is _____ the speed when it is at B.
• less than
• equal to
• greater than
A planet is orbiting a star in an elliptical orbit as shown. The speed of the planet when it is at A is _____ the speed when it is at B.
• less than
• equal to
• greater than