My Notes O Ask Your 10. O-1 points SerCP9 5 P051 soln. ing a pulley system faste

Question

My Notes O Ask Your 10. O-1 points SerCP9 5 P051 soln. ing a pulley system fastened to the roof of the building. A 3.60-kN piano is lifted by three workers at a co Each worker is able to deliver Neglecting the mass of the pulley 145 W of power, and the pulley system is 75.0% efficient (so that 25.0% of the mechanical energy is lost due to friction in the pulley). , find the time required to lift the piano from the street to the apartment. min Need Help? ReadTalk to Tutor Submit Answer Save Progress Practice Another Version

Explanation / Answer

Given,

W = 3.6 kN = 3.6 x 10^3 N ; H = 27.3 m ; P = 145 W ; e = 75 % ; n = 3

we know that,

W = F x d

P = W/t = F x d/t

P = F (d/t) = F v

Again, P = W/t

t = W/P = F d/ (n P e)

t = 3.6 x 10^3 x 27.3/(3 x 145 x 0.75) = 301.24 sec = 5.02 min

Hence, t = 5.02 min

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