- #1
qspartan570
- 14
- 0
Homework Statement
While running up stairs at a (vertical) rate of 0.30 m/s, a man of 70 kg generates waste heat at a rate of 1300 J/s. What efficiency for the human body can you deduce from this?
Homework Equations
efficiency of heat engine=e=[itex]\frac{W}{Q1}[/itex]=[itex]\frac{Q1-Q2}{Q2}[/itex]=1-[itex]\frac{Q2}{Q1}[/itex]
The Attempt at a Solution
Kinetic energy= [itex]\frac{1}{2}[/itex](70)(.30)2= 3.15
e[itex]\frac{3.15}{1300}[/itex]=0.0024 X 100=0.024 %
According to the book the answer is 14%
How do I get to this answer?