# Problem 6-23 Centripetal force

A child has tied a piece of wood of mass $0.47\; kg$ to a string and is swinging it in a vertical circle of radius $83\; cm$. At the top of the circle:

(a) draw a free body diagram for the wood,
(b) determine the magnitude of the tension in the string, if the speed of the wood is $3.7 \;m/s$.

This problem is virtually solved if you get the FBD correct. Which is the right one?

(A)

(B)

(C)

(D)

(E)