Q: When a stone tied to a string is whirled in a circle, the work done on it by the string:
(a)is positive.
(b)is negative.
(c)is zero.
(d)depends on the mass of the stone.
Correct Answer: (c)
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Q: When a stone tied to a string is whirled in a circle, the work done on it by the string:
Correct Answer: (c)