8.What work is done when a person pushes an 80 kg washing machine 12m across the floor. The force of friction between the washing machine and floor is 500 N.
Assuming the washing machine is pushed at a constant speed, the force F needed will equal 500 N
W = Fd = 500(12) = 6000J
9. A sailor pulls a boat along a dock using a rope at an angle of 60° with the horizontal. How much work does the sailor do if he exerts a force of 255 N on the rope and pulls the boat 4.0m?
W = Fd cosθ = 255(4)(cos60°) = 510J