PHYSICS A pulley system is used to lift a piano 3.1 m.The acceleration of gravity is 9.81 m/s?
A pulley system is used to lift a piano 3.1 m.
The acceleration of gravity is 9.81 m/s
If a force of 2255 N is applied to the rope
as the rope is pulled in 19 m, what is the
efficiency of the machine? Assume the mass
of the piano is 735 kg.
Answer in units of %.
- Anonymous1 month ago
Theoretical work needed = mass of piano * g * vertical height.
Work = force * distance = 2255 N * 19 m = actual work you exerted in J.
Small number divided by big number multiplied by 100 = efficiency.