I need help with this

Question

1.) A machine weighing 10,000 newtons was pulled up an incline 50 m long and 5.0 m high if the force used to overcome is 400 newtons.

a.) What is the work input?

b.) What is the work output?

c.) What is the Efficiency

Instead of putting the formula to it (you can still put it), can you please tell me what numbers I should divide or multiply by this or that (Thank you!!)

Answer 1

Hi Patrick S.,

Sorry, question is not clear. "force used to overcome"? Perhaps you mean frictional force; that would make sense and enable a solution. If so, first figure total gravitational work done = mgh; next, figure work done solely against friction = 400 N * 50 m (assume the 50 m figure is measured on the diagonal?). Add those together, that's the total energy input (work done by the engine); work output = gravitational work done on the mass. Divide appropriately to find efficiency of the operation)..

--Cheers, --Mr. d.