If electricity costs 17.4 cents/kW-hr, how much will it cost to run the pump for 72 hours? (enter your answer in dollars to three significant figures)
If electricity costs 17.4 cents/kW-hr, how much will it cost to run the pump for 72 hours? (enter your answer in dollars to three significant figures)
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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Transcribed Image Text:Part A
In order to keep a basement from flooding, it is necessary to pump 285 kg of water each minute from the basement up to a height of 3.28 m (and then outside).
18.6% of the total energy used by the pump is wasted as heat, what is the minimum wattage pump that is required to keep the basement from flooding? (enter your answer to three significant figures)
possibly useful:
P = AE/At
Ugrav = mgh
%3D
g = 9.81 m/s?
%3D
1 kW-hr 3.60 x 106 J
%3D
188 W
Scbmit
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Part B
If electricity costs 17.4 cents/kW-hr, how much will it cost to run the pump for 72 hours? (enter your answer in dollars to three significant figures)
235
dollars
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