Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 13P
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Question
Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 70 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 670 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result?
%
If your actual efficiency is 0.19, how many kcal did you really burn?
kcal
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