Question

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Whirl the ball on a string in a horizontal circle, being.Whirl the ball again in a horizontal circle. Reduce the radius r of the circle to about 2 r by pulling or careful not to hit anybody with it. Try to maintain the the string hanging below your hand. What all at constant speed. You will find it useful to run happened to the speed of the ball? Did you notice he string through the supplied drinking straw and anything about the pull on your hand by the old the straw in your hand, keeping the string taut string? If yes, what? vith your other hand. If you make the axis of rotatior irectly over your head you will be much less likely to E. Was the kinetic energy conserved as the radius of it yourself in the head with the ball. the circle was being reduced? Explain. F.Was the angular momentum conserved as the radius of the circle was being reduced? Explain. 3. If the speed of the ball was v when the radius of the circle was r, what was the speed when the radius of the circle was 2 r? If the magnitude of the angular velocity of the ball was w when the radius of the circle was r, what was its magnitude when the radius of the circle was 2 r?

Answer 1

Raduis is aduced R. pulted bliy Repe -divechon So ;the in Лере -divecion in the no & Hence, momenkmir x-dir^ is constant (Momewin) Momentum,nita fhal (Hc mRV Ve locity ot doublad So, inital m(v. (RA) m ral force Forcencyeasec on the hard

E) 1. Tnital K.E = tm(V) Final is no Conuved No Kinet Momentum oill in mo radius i decreased. ke consenad e ven mv, R IniHal momentym = Final Mementy m Speed become turce Airat 2V IniHal Vi 4R final
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