when electrical appliances whose power usage is x watts is run Y seconds , it uses XXY joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt hour ( Kwh, that is, 1 kilometer used for 1 hour) How much does it cost $0.09 per kilowatt-hour, how much does it cost per megajoules?

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter1: Units And Measurement
Section: Chapter Questions
Problem 66P: Consider the equation 4000/400=10.0 . Assuming the number of significant figures in the answer is...
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when electrical appliances whose power usage is x watts is run Y seconds , it uses XXY joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt hour ( Kwh, that is, 1 kilometer used for 1 hour) How much does it cost $0.09 per kilowatt-hour, how much does it cost per megajoules?

 

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