Question 86
When a child folds his hands on a rotating turntable, reducing moment of inertia to 2/5 of initial, what happens to rotational kinetic energy?
Question 87
A child stands on a rotating turntable with arms outstretched at 40 rev/min. If the child folds hands and reduces moment of inertia to 2/5 of initial, what is the new angular speed?
Question 88
A solid cylinder of mass 20 kg rotates about its axis with an angular speed of 100 rad/s. The radius is 0.25 m. What is the magnitude of angular momentum?
Question 89
A solid cylinder of mass 20 kg rotates about its axis with an angular speed of 100 rad/s. The radius is 0.25 m. What is the rotational kinetic energy of the cylinder?
Question 90
Two objects, a hollow cylinder and a solid sphere, have the same mass and radius. Equal torques are applied about their respective axes of rotation. Which one will acquire a greater angular speed after a given time?