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Unformatted text preview: orm cylinder.) (a) [4pt] How many revolutions did the wheel make after the driving motor was disconnected?
Since the deceleration is constant, the average angular velocity is
In 16.0 seconds, the platform rotates through an angle of (b) [6pt] What was the frictional torque acting on the platform? The angular acceleration has magnitude The torque is with Then (c) [6pt] How much power was required from the motor to maintain a steady speed of 3.00
rev/s? The motor must provide a torque balancing the frictional torque, so 3 Problem 3: [20pt] Answer these multiple-choice questions by circling the correct letter.
Showing your work is not required, but partial credit is possible if you show your work.
(a) [4pt] A truck going 15 km/h has a head-on collision with a small car going 30 km/h. Which
statement best describes the situation?
(A) The truck has a greater change in momentum.
(B) The car has a greater change in momentum.
(C) The changes of momentum of the car and truck have the same magnitude.
(D) The momenta of the...
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