A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)
A) She is subject to a constant non-zero torque. B) Her kinetic energy remains constant.
C) Her moment of inertia remains constant. D) Her angular momentum remains constant.
D
You might also like to view...
Draw the structural formula for 3-hexene
the magnetic field increases in magnitude with time.
A. The induced current flows clockwise. B. The induced current flows counterclockwise. C. No current flows in the loop. D. A current flows, but one needs additional information to determine the direction in which it flows. E. One needs additional information to determine even whether a current flows or not.
A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ b. 45 kJ c. 75 kJ d. 90 kJ e. 230 kJ
A 90. kg person is sitting in a boat at rest with a mass of 100 kg. In the boat is a stone with a mass of 5.00 kg. The person throws the stone at 4.00 m/s horizontally in the NORTH direction. The velocity of the person and the boat after the throwing of the stone is
A. 2.00 m/s NORTH. B. 1.21 m/s SOUTH. C. 1.21 m/s NORTH. D. 0.11 m/s SOUTH. E. 0.11 m/s NORTH.