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Integrated Concepts(a) An immersion heater utilizing 120 V

Chapter 20, Problem 67

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QUESTION:

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 20.0ºC 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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QUESTION:

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 20.0ºC 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.

ANSWER:

Solution 67PE

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