How much thermal energy is created in the slope and the tube during the ascent of a 30-m-high, 120-m-long slope?

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Misael

Physics

2 June, 21:48

How much thermal energy is created in the slope and the tube during the ascent of a 30-m-high, 120-m-long slope?

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Emerson Griffith · Answer 1

The change in internal energy is only gravitional PE because the tube is being drug up at a constant speed. Since it is at a constant speed, the change in KE is 0. Change in PE = m*g*h = 78 kg * 10 m/s^2 * 30 m = 23400 J Work done on the system is from the force Work = force * distance = 350 N * 120 m = 42000 J So, work added 42000 J to the system, but the rider's energy only increased 23400 J. Therefore, friction took up the difference. Friction is where the thermal energy comes from Q = 42000 J - 23400 J = 18600 J. Therfore, friction generated 18600 J of heat to the surroundings.