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Question :
76. The Earth's gravity exerts no torque a satellite orbiting : 2102165

76. The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points:

A. the tangential velocities are the same.

B. the angular velocities are the same.

C. the angular momenta are the same.

D. the kinetic energies are the same.

77. The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At the point closest to the Earth:

A. the angular speed will be greatest although the linear speed will be the same.

B. the speed will be greatest although the angular speed will be the same.

C. the kinetic energy and angular momentum will both be greater.

D. None of the above.

78. A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole it shortens. How long is the rope when the ball is moving at 5.0 m/s?

A. 1.8 m

B. 1.5 m

C. 1.2 m

D. 1.0 m

79. An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 5*g* = 49 m/s^{2}?

A. 10.1 m

B. 50.0 m

C. 72.7 m

D. 89.9 m

80. An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is:

A. 0.5 I^{2}/L.

B. 0.5 L^{2}/I.

C. 0.5 L^{2}/m.

D. 0.5 I^{2}/m.