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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
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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Please provide an answer to part B. 3.3, 3.35, 3.4 hours are all being marked as incorrect.
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 +)
Transcribed Image Text: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 +)
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