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Question 37: (a) Explain why, a cricket player moves his hands backwards while catching a fast cricket ball. (b) A 150 g ball, travelling at 30 m/s, strikes the palm of a player’s hand and is stopped in 0.05 second. Find the force exerted by the ball on the hand. Lakhmir Singh Physics Class 9 |
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Answer» cricketer does this to lower the force. When the PLAYER brings his hands backwards, it helps is increasing time of the force action. So as the time increases, the force also gets reduced and the player does not get injured in his hands.b) Given,Mass = 150 gNow, we SHALL convert it into kg.m = 0.15 kgThe starting velocity is 30 m/sSo,Starting momentum = 0.15 x 30 = 4.5 kgm/sFinal value of momentum = 0Change OCCURED for momentum = 0 - 4.5Change occured for momentum = 0 - 4.5 = -4.5kgm/sMomentum's rate of change will be =-4.5/0.05-90 NTHE value of the force exerted is 90 N |
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