physics help.?

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the efficiency of a lift is 72.5%. what is the work needed to raise a 2.00*10^2 kg mass 5.65 m?

2007-01-09 10:38:32 · 3 answers · asked by lincolngomes301 2 in Science & Mathematics ➔ Physics

3 answers

lifted against gravity so a = 9.81

F= ma
F = 1962N

work(needed) = force * distance

work = 11085.3J

72.5/100 = 0.725

Eff = energy out/energy in

0.725 = 11085.3/energy in(actual work done)

actual work done = 15290.07J

2007-01-09 11:10:43 · answer #1 · answered by Michael M 2 · 0⤊ 0⤋

Physics are good for you!!!

2007-01-09 18:48:23 · answer #2 · answered by Anonymous · 0⤊ 0⤋

ick i hate physics.

2007-01-09 18:43:04 · answer #3 · answered by turntabl3 2 · 0⤊ 1⤋