A skater of mass 45.0 kg standing on ice throws a stone of mass 7.65 kg with a speed of 20.9 m/s in a horizontal direction. Find the distance over which the skater will move in the opposite direction if the coefficient of kinetic friction between the skater and the ice is 0.03.

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Ankit LalLv10

12 Dec 2020

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A 42.0 kg child standing on a frozen pond throws a 0.500 kg stone to the east with a speed of 6.00 m/s. Neglecting friction between child and ice, find the recoil velocity of the child. (Assume east is the positive direction.)

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I figured out the first one.
7.18Ã10-1 rad/s

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Calculate the ration of the final kinetic energy to the originalkinetic energy.

Can anyone help me get started on the second part?

A 55.0-kg ice skater is moving at 4.00 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.800 m around the pole.

(a) Determine the force exerted by the horizontal rope on her arms.

(b) Compare this force with her weight.