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A worker exerts a force of 119N on a lever to raise a block. The efficiency of the lever is 91.6%. If the lever is moved .770m, the block rises to a height of .180m. What is the mass of the block?

2007-03-22 14:49:12 · 1 answers · asked by Adam P 1 in Science & Mathematics ➔ Physics

1 answers

Work done by force = F * d = 119 * .770 work it out

Since efficiency is only .916, work done to lift object is

only .916 * above work

work done to lift object = mgh

so .916 * 119* 0.770 = m*9.8*.180 Solve for m

2007-03-22 16:27:18 · answer #1 · answered by hello 6 · 0⤊ 0⤋