College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question

A heater is placed in 5 liters of ethanol, which has a specific heat capacity of 2.44 joules per gram kelvin and a specific gravity of 0.7893.

Assume the initial temperature of the ethanol is 70 degrees Fahrenheit, the heater is powered by a voltage of 240 volts at a current of 500 milliamperes, and the transfer of energy to the ethanol as heat has an efficiency of 45%.

How long must the heater operate to raise the temperature of the ethanol to 95 degrees Fahrenheit? Express your answer in units of minutes.

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