College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
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.
The heating element of a coffeemaker operates at 120 V and carries a current of 6.00 A. Assuming the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat 0.680 kg of
water from room temperature (23.0°C) to the boiling point.
min
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Chapter 20 Solutions
College Physics
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