Physics for Scientists and Engineers With Modern Physics
9th Edition
ISBN: 9781133953982
Author: SERWAY, Raymond A./
Publisher: Cengage Learning
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Chapter 45, Problem 69AP
(a)
To determine
The required amount of cooling water.
(b)
To determine
The magnitude of rate of fuel burning.
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1. Suppose a woman does 500 J of work and -9400 J of heat transfer occurs into the environment in
the process.
(a) What is the decrease in her internal energy, assuming no change in temperature or consumption
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ΔΕint
✓ J
(b) The internal energy is stored energy due to food intake. Treating the change in internal energy as
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Efficiency, Eff:
%
(c) What physics law did you use in this problem?
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In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector.The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 20% (that is, 80% of the incident solar energy is lost from the system). What collector area is necessary to raise the temperature of 200 L of water in the tank from 20C to 40°C in 1.0 h when the intensity of incident sunlight is 700 W/m2?
A liquid food product (P) is being cooled from 80°C to 30°C in an indirect heat exchanger using cold water (W) as a cooling medium. If the product mass flow rate is 1800 kg/h, determine the water flow rate required to accomplish product cooling if the water is allowed to increase its temperature from 10°C to 20°C in the heat exchanger. The specific heat of the product is 3.8 kJ/kg K, and the value for water is 4.1kJ/kg K.
Chapter 45 Solutions
Physics for Scientists and Engineers With Modern Physics
Ch. 45.1 - When a nucleus undergoes fission, the two daughter...Ch. 45.2 - Prob. 45.2QQCh. 45.3 - Prob. 45.3QQCh. 45.4 - Prob. 45.4QQCh. 45 - Prob. 1OQCh. 45 - Prob. 2OQCh. 45 - Prob. 3OQCh. 45 - Prob. 4OQCh. 45 - Prob. 5OQCh. 45 - Prob. 6OQ
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