Question

 T_i +U_net = T_f.

 Or, to summarize in words, the initial translational and rotational kinetic energy of a rigid body plus the work done by all the external forces and couple moments acting on the body as it moves from the initial to the final configuration is equal to the final total kinetic energy of the body.

Part B

A man having weight w=720 N crouches at the end of a diving platform, as shown in the figure.

(Figure 3)

In the crouched position, the diver's center of gravity is d=0.44 m above the board and the diver's radius of gyration about his center of gravity is kG=0.37 m. While holding this position at θ=0∘, the diver rotates about his toes at A until he loses contact with the platform when θ=90°. If the diver remains in this crouched position throughout the dive, approximately how many revolutions will he make before striking the water after falling h=9 m?

Express your answer to three significant figures.

Answer 1