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ainaz89

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## Homework Statement

prime mover = 220 hp

crane = 2000 tonne

velocity crane = 10m/min = 0.17m/sec

acceleration crane = 0.017m/sec

every 100 tonne = 6 tonne of friction

1hp = 726 W

1 tonne = 1000 kg

## Homework Equations

how many prime mover are needed to pull the crane?prime mover 220 hp = 164120W

for every 100 tonne = 6 tonne of friction

2000tonne = 120 tonne of friction

m = 2000tonne - 120 tonne = 1880 tonne

P = F*v

= mg * v

= (1880*1000)(9.81)*(0.17)

= 3135276W

so, total of PM = 3135276/164120

= 19 units.

the answer should be less than 10 units.

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