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Q. A kg circus performer oscillates up and down at the end of a long elastic rope at a rate of once every s. By how much is the rope extended beyond its unloaded length as the performer hangs at rest?

Q. What is the rms speed of the molecules in low-density hydrogen gas at 0 ^circ {rm C}? (The mass of a hydrogen molecule, rm{H_2} , is 3.32×10-27 kg ).

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