6-23.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?