Question

A stone of mass 0.3 kg tied to the end of a string is whirled round in a circle of radius 1.2 m with a speed of 20 rev./ mim in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirl around if the string can withstand a maximum tension of 100 N?

A 0.75 N, 20 m/s
B 6.57 N, 34.6 m/s
C 6.57 N, 39.6 m/s
D 1.57 N, 20 m/s
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