Chapter 6 Concepts Physics

*See PDF for Figure(13)*

C

*See PDF for Figure(15)*

D

If the Earth had four times its present mass, what would be its new period of revolution around the sun, compared to its present orbital period? A) one-half as much B) four times as much C) two times as much D) the same E) one-fourth as much

D

A race car, traveling at a constant speed of 50 m/s, drives around a circular track of radius 250 m. What angular acceleration does it experience? A) zero B) 1.0 × 1 rad/s^2 C) 1.0 × 101 rad/s^2 D) 6.3 × 1 rad/s^2 E) 2.0 × 1 rad/s^2

A

A spaceship is traveling to the moon. At what point is it beyond the pull of Earth's gravity? A) It is never beyond the pull of Earth's gravity. B) when it is closer to the moon than it is to Earth C) when it is three-fourths of the way there D) when it gets above the atmosphere E) when it is half-way there

A

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger centripetal acceleration? A) Child A B) Child B C) They have the same non-zero centripetal acceleration. D) They have the same zero centripetal acceleration. E) There is not enough information given to answer the question.

A

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger linear displacement? A) Child A B) Child B C) They have the same zero linear displacement. D) They have the same non-zero linear displacement. E) There is not enough information given to answer the question.

A

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger tangential speed? A) Child A B) Child B C) They have the same zero tangential speed. D) They have the same non-zero tangential speed. E) There is not enough information given to answer the question.

A

A pilot executes a vertical dive. Just before the plane starts to come up from the bottom of the dive, the force on him is A) equal to g, and pointing down. B) more than g, and pointing up. C) less than g, and pointing down. D) more than g, and pointing down. E) less than g, and pointing up.

B

Satellite A has twice the mass of satellite T, and rotates in the same orbit. Which of the following is true? A) The speed of T is three-fourths the speed of A. B) The speed of T is equal to the speed of A. C) The speed of T is twice the speed of A. D) The speed of T is half the speed of A. E) The speed of T is one-fourth the speed of A.

B

Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon A) the universal gravitational constant. B) the radius r. C) the satellite mass. D) g at the satellite position. E) the planet mass.

C

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular speed? A) Child A B) Child B C) They have the same non-zero angular speed. D) They have the same zero angular speed. E) There is not enough information given to answer the question.

C

Does the centripetal force acting on an object do work on the object? A) yes, since it takes energy to turn an object B) no, because the object has constant speed C) yes, since a force acts and the object moves, and work is force times distance D) no, because the force and the displacement of the object are perpendicular E) yes, because the force and the displacement of the object are perpendicular

D

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular displacement? A) Child A B) Child B C) They have the same zero angular displacement. D) They have the same non-zero angular displacement. E) There is not enough information given to answer the question.

D

A car, driven around a circle with constant speed, must have A) a centrifugal acceleration. B) zero acceleration. C) a tangential acceleration. D) zero velocity. E) a centripetal acceleration.

E

A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. The acceleration of gravity at the satellite, as compared to the acceleration of gravity on the surface of Mars, is A) the same. B) zero. C) one-third as much. D) one-ninth as much. E) one-sixteenth as much

E

The following statements refer to man-made, artificial satellites in orbit around Earth. Which is an accurate statement? A) The period of revolution of a satellite moving about the Earth is independent of the size of the orbit it travels. B) It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit. C) Only circular orbits are possible for artificial satellites. D) The velocity required to keep a satellite in a given orbit depends on the mass of the satellite. E) A satellite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit.

E

The net force on an object in orbit is zero.

False

When a rigid body rotates about a fixed axis all the points in the body have the same centripetal acceleration.

False

When a rigid body rotates about a fixed axis all the points in the body have the same linear displacement.

False

When a rigid body rotates about a fixed axis all the points in the body have the same tangential acceleration.

False

When a rigid body rotates about a fixed axis all the points in the body have the same tangential speed.

False

When a rigid body rotates about a fixed axis all the points in the body have the same angular acceleration

True

When a rigid body rotates about a fixed axis all the points in the body have the same angular displacement.

True

When a rigid body rotates about a fixed axis all the points in the body have the same angular speed.

True