Machine Ramp
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What is the work done on the block by the machine? (Joules help!?)?
A mover's dolly is used to transport a refrigerator up a ramp into a house. The block has a mass of 100 kg. The ramp is 2.10 m long and rises 0.850 m. The mover pulls the dolly with a force of 511 N up the ramp. The dolly and ramp constitute a machine.
(a) What work does the mover do? (Joules)
(b) What is the work done on the block by the machine? (Joules)
(c) What is the efficiency of the machine? (Percentage)
The total work done on the block is the change in potential energy of the block
W = m*g*∆h = 100*9.8*0.850 J 833
The work done by the mover is the force applied times the distance moved.
Wm = 511*2.10 = 1073 J
It took 1073 of work input to produce 833 J of actual work, so the efficiency is 833/1073 = 0.776 = 77.6%