A waiter is carrying a tray above his head and walking at a constant velocity. If he applies a force of 5.0 newtons on the tray and covers a distance of 10.0 meters, how much work is being done?

Respuesta :

Answer:

0 J

Explanation:

Work is the dot product of force and displacement.  In other words, it is the force times the distance traveled in the direction of the force.

W = Fd cos θ

In this case, the force is vertical and the displacement is horizontal.  So the angle between them is θ = 90°.  The work done is:

W = (5.0 N) (10.0 m) cos(90°)

W = 0 J