A mover\'s dolly is used to transport a refrigerator up a ramp intoahouse. The r

Question

A mover's dolly is used to transport a refrigerator up a ramp intoahouse. The refrigerator has a mass of 114kg. The ramp is 2.10 m long and rises 0.850 m. Themover pulls thedolly with a force of 508N up the ramp.The dolly and ramp constitute a machine.

(a) What work does the mover do?

(b) What is the work done on the refrigerator by the machine?

(c) What is the efficiency of the machine?
**Checked the work on the solution and theanswergiven for part A has W=fd. But on incline planeshouldn'tW=fdcos()?? Just checking

(a) What work does the mover do?

(b) What is the work done on the refrigerator by the machine?

(c) What is the efficiency of the machine?
**Checked the work on the solution and theanswergiven for part A has W=fd. But on incline planeshouldn'tW=fdcos()?? Just checking

Explanation / Answer

Win = F d = 508 * 2.1 =1067 J      work input Wout = m g h = 114 * 9.8 * .85 = 950 J Efficiency = Wout / Win = 950 / 1067 =.89 = 89%

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