An electric heater consists of a single resistor connected across 110 V. It is used to heat 200.0 g of water in a coffee cup from 20°C to 90°C in 2.70 min. 1) Assuming that 90% of the energy drawn from the power source goes into heating the water, what is the resistance of the heater? Use c = 4186 J/kg-K (Express your answer to two significant figures.) 30.1 2Submit 2) Assuming no other heat losses, how much longer will it take to heat your water if you had to power the water heater with your 12.0-V car battery? (Express your answer to two significant figures.) h Submit

An electric heater consists of a single resistor connected across 110 V. It is used to heat 200.0 g of water in a coffee cup from 20°C to 90°C in 2.70 min. 1) Assuming that 90% of the energy drawn from the power source goes into heating the water, what is the resistance of the heater? Use c = 4186 J/kg-K (Express your answer to two significant figures.) 30.1 2Submit 2) Assuming no other heat losses, how much longer will it take to heat your water if you had to power the water heater with your 12.0-V car battery? (Express your answer to two significant figures.) h Submit

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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