A child whirls a small stone tied to a string in a horizontal circle of radius

PHYSICS · Multi-part · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

40\,\text{cm}

. The stone completes one revolution in

0.50\,\text{s}

. (i) Calculate the speed of the stone. (ii) How much distance will the stone cover in

20

complete revolutions? (iii) If the time taken for one revolution is suddenly reduced to

0.25\,\text{s}

while the radius remains unchanged, what will be the new speed?