To make puck handling easy, hockey pucks are kept frozen until they are used in

Question

To make puck handling easy, hockey pucks are kept frozen until they are used in the game.
(a) Explain why room-temperature pucks would be more difficult to handle on the end of a stick than a frozen puck. (Hint: Hockey pucks are made of rubber. (explain please)






(b) A room-temperature puck rebounds 16.4 cm when dropped onto a wooden surface from 101.0 cm. If a frozen puck has only half the coefficient of restitution of a room-temperature one, predict how high the frozen puck would rebound under the same conditions.
cm

Explanation / Answer

A) As the puck (made of rubber) rebounds more at the room tempearture than is rebound at the freezing temperature, the pucks are freezed before they used B) The height from which the puck is dropped is h = 101.0 cm The height upto which the puck is raised is h' = 16.4 cm The coefficient of restitution is defined as the ratio of the relative velocity of seperation before collision to the relative velocity of approach after the collision and is given by e = (vrel,sep)/(vrel,app) e = (h'/h)                  (v = 2gh for free fall) Therefore the coefficient of restitution is e = (16.4 cm/101.0 cm) e = 0.403 At the freezing temperature, the coeffficient of restitution is e' = e/2 e' = 0.2015 The height to which the puck is raised, dropped from 101.0 cm, at the freezing temperature is h' = e'2h h' = (0.2015)2(101.0 cm) h' = 4.1 cm

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