A skier of mass 60 kg is pulled up (a) How much work is required to pull him 55 m up a 30° slope (assumed frictionless) at a constant speed of 1.5 m/s? slope by a motor-driven cable. (b) What power must a motor have to perform this task? hp

A skier of mass 60 kg is pulled up (a) How much work is required to pull him 55 m up a 30° slope (assumed frictionless) at a constant speed of 1.5 m/s? slope by a motor-driven cable. (b) What power must a motor have to perform this task? hp

Name: I nees help on both problems. I don't know how to start. A skier of ma
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Description: I nees help on both problems. I don't know how to start. A skier of mass 60 kg is pulled up(a) How much work is required to pull him 55 m up a 30° slope(assumed frictionless) at a constant speed of 1.5 m/s?slope by a motor-driven cable.(b) What power

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter8: Potential Energy And Conservation Of Energy

Section: Chapter Questions

Problem 32P: A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of...

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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?
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A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30.0 above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 12.0 s and then continues at constant speed. (a) What power must the winch motor provide when the car is moving at constant speed? (b) What maximum power must the winch motor provide? (c) What total energy has transferred out of the motor by work by the time the car moves off the end of the track, which is of length 1 250 m?
Repeat the preceding problem, but this time, suppose that the work done by air resistance cannot be ignored. Let the work done by the air resistance when the skier goes from A to B along the given hilly path be —2000 J. The work done by air resistance is negative since the air resistance acts in the opposite direction to the displacement. Supposing the mass of the skier is 50 kg, what is the speed of the skier at point B ?