College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 20, Problem 67PE
Integrated Concepts
(a) An immersion heater utilizing 120 V can raise the temperature of a 1.00 × 102 -g aluminum cup containing 350 g of water from 20.0°C to 95.0°C in 2.00 min. Find its resistance, assuming it is constant during the process. (b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.
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(a) An immersion heater utilizing 120 V can raise the temperature of a 1.00 X 102-g aluminum cup containing 350 g of water from 20.0oC to 95.0oC in 2.00 min. Find its resistance, assuming it is constant during the process.
(b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.
(a) An immersion heater utilizing 120 V can raise the temperature of a 1.00×102 -g aluminum cup containing 350 g of water from 20.0ºC to 95.0ºC in 2.00 min. Find its resistance, assuming it is constant during the process. (b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.
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cm? and the rate per unit area at which it receives energy from light is 5.1 mW/cm². What is the efficiency of the cell for converting
light energy to thermal energy in the 940 Q external resistor?
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Chapter 20 Solutions
College Physics
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