An electric car is designed to run off a bank of 12.0 V batteries with a total energy storage of 2.30x107 J. (a) If the electric motor draws 7.20 kW, what is the current delivered to the motor?  (b) If the electric motor draws 7.20 kW as the car moves at a steady speed of 21.0 m/s, how long will the car remain powered before it is out of juice? (c) If the electric motor draws 7.20 kW as the car moves at a steady speed of 21.0 m/s, how far will the car travel before it is out of juice?

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter22: Electric Current
Section22.2: Using Electric Energy
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An electric car is designed to run off a bank of 12.0 V batteries with a total energy storage of 2.30x107 J. (a) If the electric motor draws 7.20 kW, what is the current delivered to the motor?  (b) If the electric motor draws 7.20 kW as the car moves at a steady speed of 21.0 m/s, how long will the car remain powered before it is out of juice? (c) If the electric motor draws 7.20 kW as the car moves at a steady speed of 21.0 m/s, how far will the car travel before it is out of juice? 

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