A stone is tied to a 0.50-m string and whirled at a constant speed of 4.0 m/s in a vertical circle.Its acceleration at the top of the circle is: A)9.8 m/s², up B)9.8 m/s², down C)8.0 m/s², down D)32 m/s², up E)32 m/s², down

Question

Quizplus · Accepted Answer

The centripetal acceleration is v^2/r = (4.0 m/s)^2 / 0.50 m = 32 m/s^2. At the top of the circle, the acceleration is directed towards the center of the circle, which is downwards.

A Stone Is Tied to a 0