a) you stand on your tiptoes and your body mass is 70 kg . the distance from tip

Question

a) you stand on your tiptoes and your body mass is 70 kg . the distance from tiptoe to the ankle joint is 15 cm , the distance to your heel where the achilles tendon is attached is 20 cm .How much of your body weight has to be hold by your achilles tendon ?
What is the force necessary ?
b) Strictly speaking , does the falling of autumn leaves tend to lengthen or shorten the 2r-hour day ? explain - what physical principle supports your answers ?

Explanation / Answer

The falling of autumn leaves tends to shorten the 24 hour day. Consider angular momentum conservation, when the mass is distributed away from the centre of mass, the rotation of the body is slower than when the mass is distributed closer to the centre of mass.Similarly, when the leaves fall down in autumn, the mass distribution of Earth comes closer to the centre of mass of the Earth, resulting in increase in its angular speed and shortening the time period of one oscillation i.e. a day.

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