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Q. A copper rod (length=2 m, radius=3×10-3 m) hangs down from the ceiling. A 9.0-kg object is attached to the lower end of the rod. The rod acts as a "spring," and the object oscillates vertically with small amplitude. Ignoring the rod's mass, determine frequency f of the simple harmonic motion.

Q. A 56.0 kg girl weighs herself by standing on a scale in an elevator. What is the force exerted by the scale while the elevator is descending at a constant speed of 10 m/s?

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Category:- Physics
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