Physics - Rotation Question with Solution | TestHub

When an athelete takes off from the ground in a long jump, the force on the launching foot gives her an angular momentum in clockwise direction around the horizontal axis. This rotation would not allow her to land properly. In the landing, the legs should be together and extended forward at an angle so that heels marks the sand at greatest distance. Once in air the angular momentum cannot change. However, the jumper can shift most of the angular momentum to the arms by rotating them clockwise as shown in the figure. Then the body comes to proper orientation for landing. Assume that in 0.7 sec one arm covers 1/2 a revolution and another arm covers 1 revolution. Each arm is a thin rod of mass 4 kg and length 0.6 m rotating at one end. Assume that this 0.7 sec. is time of flight.\\

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