A45-kg boy pulls a wagon with a force of 38 n for a distance of 550 m. if the boy
takes 240 s, what is the power expended by the boy?

87.08 W

Explanation:

Power expended by the boy is power needed/ power experienced to/by the wagon throughout this process of pulling.

When the force F is constant and the angle between the force and the displacement s is θ, then the work done is given by W = Fs cos θ.

Assuming that the force and displacement of the wagon are in the same direction cos(θ)= cos(0)= 1

So, W= 38 * 550 (SI units)

W=20,900 J

Power =

87.08 W

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.