At any angular speed, a certain uniform solid cylinder of diameter D has twice as much rotational kinetic energy as a certain uniform thin-walled hollow cylinder of the same diameter when both are spinning about an axis through their centers. If the mass of the hollow cylinder is m, the mass of the solid cylinder is
A) 1/4 m.
B) 1/2 m.
C) m.
D) 4 m.
E) 8 m.

Which feature of a heating curve indicates a change ofn state

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.