chapter 5 circular motion and gravity
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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. .

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slide2

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.
slide3

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.
slide4

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

slide5

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

slide6

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.
slide7

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.
slide8
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
slide9
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
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 speed1
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
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 motion1
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
slide16

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?

slide17

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?

slide18
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
slide19
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
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