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In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 7.8x105 J of internal energy.
(a) One player, dressed too lightly for the weather, has to leave the game after losing 6.5x105 J of heat. How much work has he done?
(b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.2x105 J of work. What is the magnitude of the heat that he has lost?
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In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.12 106 m/s. Find the centripetal acceleration of the electron
A 25g ball is fired with an initial speed v1 toward a 150g ball that is hanging motionless from a 1.30m string. The balls have a perfectly elastic collision. As a result, 150 g ball swings out until the string makes an angle of 37° with vertical. ..
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