A jogger with mass m = 55 kg uses energy at a rate of P = 745 W when she jogs on horizontal ground at a constant speed of s = 4.6 m/s. The efficiency of her “human engine” however, is e = 0.37. (In other words, the power used for locomotion is e = 0.37 times the total power.) a. Write an expression for the rate of energy expenditure when she jogs at the same constant speed up a slope of φ = 6.21 degrees. Assume whatever frictional or drag forces are the same in each case. Your answer should be in terms of the symbols given in the problem statement and g (9.80 m/s2). b. What is the rate of energy expenditure when she jogs up the slope, in watts?
A jogger with mass m = 55 kg uses energy at a rate of P = 745 W when she jogs on horizontal ground at a constant speed of s = 4.6 m/s. The efficiency of her “human engine” however, is e = 0.37. (In other words, the power used for locomotion is e = 0.37 times the total power.) a. Write an expression for the rate of energy expenditure when she jogs at the same constant speed up a slope of φ = 6.21 degrees. Assume whatever frictional or drag forces are the same in each case. Your answer should be in terms of the symbols given in the problem statement and g (9.80 m/s2). b. What is the rate of energy expenditure when she jogs up the slope, in watts?
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 7PE: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...
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A jogger with mass m = 55 kg uses energy at a rate of P = 745 W when she jogs on horizontal ground at a constant speed of s = 4.6 m/s. The efficiency of her “human engine” however, is e = 0.37. (In other words, the power used for locomotion is e = 0.37 times the total power.)
a. Write an expression for the rate of energy expenditure when she jogs at the same constant speed up a slope of φ = 6.21 degrees. Assume whatever frictional or drag forces are the same in each case. Your answer should be in terms of the symbols given in the problem statement and g (9.80 m/s2).
b. What is the rate of energy expenditure when she jogs up the slope, in watts?
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