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A stone of mass 100 g tied to the end of...

A stone of mass 100 g tied to the end of a string 80 cm long is whirled in a horizontal circle with a constant speed.If the stone makes 14 revolutions in 25 s, calculate the centripetal force acting on the stone.

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The correct Answer is:
0.989 N
`F = m xx (2pin)^(2)r = 0.1 xx 4pi^(2) xx (14//25)^(2) xx 0.8 = 0.989 N`
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