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 20P
To determine
The electrical power produced by water.
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20. If 60 percent of the potential energy of water flowing over a dam can be converted to electricity, find the maximum power output, in kW (kilowatts), for a dam 50 m high where the water crosses at a rate of 300,000 kg/min
(1 watt = 1 joule/sec, 1 kW = 1000 watts)
A bucket full of sand has a mass of 20 kg (including the bucket and the sand). The bucket is to be lifted to
the top of a building 15 meters tall by a rope of negligible weight. However, the bucket has a hole in it, and
leaks 0.1 kgs of sand each meter it is lifted.
Find the work done lifting the bucket to the top of the building.
Hint: Force = (mass)(acceleration). For this problem, the force will be a product where a
m
9.8
82
Joules
A bucket with mass 2 kg begins holding a mass of 30 kg of sand. The bucket is to be lifted to the top of a 10 meter tall building by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.1 kg of sand each meter it is lifted. Find the work done lifting the bucket to the top of the building.
Chapter 7 Solutions
Physics for Scientists and Engineers, Vol. 1
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