- #1
husky88
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Homework Statement
A force of 120 N pushes a crate of mass 15 kg along the ground at a constant speed of 3.2 m/s for a distance of 6.2 m. What amount of heat energy was generated during this time?
Homework Equations
W=F*d
t=d/v
P=F*v
W=P/t
The Attempt at a Solution
I have solved this problem by finding out the work done by the force (W=F*d=744 J).
The time is t=d/v=1.9375 s.
The power that is actually used is P=F*v=384 W.
The work that is actually done is W=P/t=198.1935484 J.
So the heat energy generated is the difference between the two W amounts = 550 J.
I don't know if this is correct. I am also not using the mass given in the problem. I don't know if the mass is extra data, or if there is maybe a simpler way to do it. Maybe without using the Power, as there is no engine in the problem.
Any help or suggestions greatly appreciated. :)