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Question 41
A hollow cylinder of mass 3 kg and radius 40 cm has a rope wound around it. A force of 30 N pulls the rope. What is the angular acceleration of the cylinder?
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Question 42
A child reduces his moment of inertia to 2/5 of initial by folding arms on a frictionless rotating table. How does rotational kinetic energy change?
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Question 43
A child stands on a rotating turntable with arms outstretched. Initial angular speed is 40 rev/min. If the child folds hands and reduces moment of inertia to 2/5 of initial, what is the new angular speed?
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Question 44
A solid cylinder of mass 20 kg rotates with angular speed 100 rad/s. Radius is 0.25 m. What is the magnitude of angular momentum about its axis?
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Question 45
A solid cylinder of mass 20 kg rotates with angular speed 100 rad/s about its axis. Radius is 0.25 m. What is its rotational kinetic energy?