A 87g stopper is swung around on a string of 78 cm with a force of tension of 3N, What is the stopper's speed?

Question

also, How long will it take the stopper to make one revolution ?

Answer 1

Best Answer - Chosen by Asker

F = (mv^2)/r.
(fr) = (mv^2).
(mv^2) = 3 x 0.78, = 2.34.
v^2 = (2.34/0.087kg), = 26.89655172.
v = sqrt. 26.89655172, = 5.186m/sec.

Circumference = (.78 x 2pi), = 4.9m.
Time = (4.9/5.186) = 0.945 sec.

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thank you