# An office worker uses an immersion heater to warm 250 g of water in a light, covered, insulated cup from 20.°C to 100. °C in 4.00 minutes. The heater is a Nichrome resistance wire connected to a 120-V power supply. Assume the wire is at 100. °C throughout the 4.00-min time interval. (a) Calculate the average power required to warm the water to 100. °C in 4.00 min. (b) Calculate the required resistance in the heating element at 100. °C. (c) Calculate the resistance of the heating element at 20. °C. (d) Derive a relationship between the diameter of the wire, the resistivity at 20. °C, ρ 0 , the resistance at 20. °C, R 0 , and the length L . (e) If L = 3.00 m, what is the diameter of the wire?

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

#### Solutions

Chapter
Section
Chapter 17, Problem 48P
Textbook Problem

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