Question

1. A solid disk is rotating about the z-axis as shown in the figure.Which of the following is true about points A and B?

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A.A and B have the same tangential speed, but B has a greater angular speed.

B.A and B have the same angular speed, but B has a greater tangential speed.

C.A and B have the same angular and tangential speed.

D.A has a greater angular and tangential speed than B

E. B has a greater angular and tangential speed than A

2.Consider two communication satellites, A and B, in circular orbits. The radius of B's orbit is larger than that of A's. Which satellite has the highest orbital speed?

A.A

B.B

C.They both have the same speed

D.This cannot be found without knowing the relative masses of the objects.

3.The gravitational FORCE of the Earth ________

A.on an object is a function of an object's mass

B.affects all objects equally

C. has no effect on the rate at which objects accelerate as they fall.

D.is exactly the same size for a given object everywhere on the Earth.

4.A ball with original momentum +7.0 kg⋅m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:

A.0.

B.-21 kg⋅m/s.

C.- 28 kg⋅m/s.

D.–14 kg⋅m/s.

E. –7.0 kg⋅m/s.

5.A cannon of mass 1 300 kg fires a 13.6-kg shell with a velocity of 180 m/s at an angle of 45° above the horizontal. Find the recoil velocity of the cannon across the level ground.

A.1.88 m/s

B.1.33 m/s

C.0.376 m/s

D.0.666 m/s

E.0.942 m/s

Answer 1