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LPH 105 W15 ch6:8-10
Transcript of LPH 105 W15 ch6:8-10
(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)"