Question

a .5m string is connected to a stationary object and an object weighing .2kg spinning around in a circle at 5m/s. what is the work done by the string on the object during one full rotation

Answer 1

W = F · S = 0 work done by vectors F and S

Since F is perpendicular to S, the vector product is zero and no work is done (S moves thru no distance along F)