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# LPH 105 W15 ch6:8-10

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## Richard Datwyler

on 20 May 2016

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#### Transcript of LPH 105 W15 ch6:8-10

A 16.0 kg child descends a slide 2.20 m high, starting from rest, and reaches the bottom with a speed of 1.25 m/s. How much thermal energy due to FRICTION was generated in this process?
(c) where did the energy go?
(b) What is the ball's speed just before and just after the bounce?
You drop a ball from a height of 2.0 m and it bounces back to a height of 1.6 m.
(a) what fraction of its initial energy is lost during the bounce
A 66 kg skier starts from rest at the stop of a 1200 m long trail which drops a total of 230 m from top to bottom. At the bottom the skier is moving 11.0 m/s.
(b)pretend the slope of the hill was constant for the whole run, what was the coefficient of friction?
(a)how much energy was dissipated by friction?
A shot putter accelerates a 7.3 kg shot from rest to 14 m/s in .15 s. What average power was delivered?
During a work out a 75 kg athlete ran up the stadium stairs in 75 s. The distance along the stairs is 83 m and they are at an angle of 33 degrees. What was the average power output. Ignore friction.
A 1000 kg car slows down from 27 m/s to 18 m/s in 7.0 s, while coasting on a flat road. What approximate power is needed to keep the car traveling at a constant 22.5 m/s
internal energy, heating, friction, etc.
"Just still a little confused on setting up the equation with the free body diagram "
"I don't fully understand how the efficiency equation works. "
"Can we go over the last question on the pre-quiz?"
"How much power would be required for a 60 kg person to 'hike' the grand teton (height approximately 2000 m vertical gain) in a time of 5 hours? (answer should look like '23 W' - note this is a very inaccurate measurement of power needed)"
4770 W
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