Solution:
Tension force will provide required centripetal force so,
T = mv²/r
⇒ 200 = 5 v²/10 ⇒ v² = 400 ⇒ v =20 m/s
A store of mass 5 kg is tied to a string of length 10 m is whirled round in a horizontal circle. What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200 N :
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