1. A lawnmower does 6.9 MJ of work in an hour A. What's its power output,...
1. A lawnmower does 6.9 MJ of work in an hour
A. What's its power output, in watts?
B. What's its power output, in horsepower?
Your mass is 65 kg, and you're in an airplane where your
gravitational potential energy is7.0 MJ, where the zero of
potential is taken at sea level.
What's the plane's altitude?
Homework Answers
1) A)
P = Work (Joules) / second, thus,
P = 6.9 * 106 / 3600
P = 1916.67 W.
B) P(hp) = P(W) / 745.699872
P(hp) = 2.57 hp.
2) G.P.E = mgh
7000,000 = 65*9.8*h
h = 10.98 km.
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