Anonymous
Anonymous asked in Science & MathematicsPhysics · 7 years ago

High school Physics questions help...T.T?

1)A javelin of a given mass, the distance it will travel depends upon the force exerted by the athlete's arm and the time for which it is exerted. (Write at least 7)

2) why does the athlete hold his arm as far behind his body as he can before he starts to launch the javelin?

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  • Anonymous
    7 years ago

    "Why does the athlete hold his arm as far behind his body as he can before he starts to launch the javelin?"

    It is not as far as he can, it is as near to a straight line from his hips to his hand as he can get. The initial force to get the javelin moving comes from the hips. Then the chest muscles act, giving some more acceleration, and finally the biceps gives the last bit of thrust. This is a complex case of impedance matching, three sets of muscles acting through limited distances to contribute to the total acceleration. There is much more to the picture than this question suggests.

  • 7 years ago

    Don't just copy the answer. Make sure you understand how to solve it.

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