Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 7, Problem 98P
(a)
To determine
The rate of energy conversion.
(b)
To determine
The compression in the spring.
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Suppose the car approches a hill and has the intial speed 106 km/h at the bottom of the hill. The driver takes her foot of the gas pedal and allows the car to coast up the hill.
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The record time for a Tour de France cyclist to ascend the 1100-mm-high Alpe d'Huez is 37.5 minmin. The rider and his bike had a mass of 65 kgkg. At the average speed of the ride, the metabolic power to ride on level ground would be 700 WW. To this, we must add the power to make the climb.
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A 50.0 - kg student evaluates a weight loss program bycalculating the number of times she would need to climb a12.0 - m high flight of steps in order to lose one pound (0.45 kg)of fat. Metabolizing 1.00 kg of fat can release 3.77 x 107 J ofchemical energy and the body can convert about 20.0% of thisinto mechanical energy. (The rest goes into internal energy.)(a) How much mechanical energy can the body produce from0.450 kg of fat? (b) How many trips up the flight of steps arerequired for the student to lose 0.450 kg of fat? Ignore therelatively small amount of energy required to return downthe stairs.
Chapter 7 Solutions
Physics for Scientists and Engineers, Vol. 1
Ch. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Prob. 5PCh. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10P
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