Apulley stems has an efficiency of 65.1%. if you perform 350 j of work, how much useful work does the pulley perform?

a. 350 j
b. 301 j
c. 228 j
d. 122 j

C. 228 Joules

Efficiency of a machine is the energy or work output, divided by the energy or work input, and expressed as a percentage. An ideal machine would have an efficiency of 100%.

Efficiency = (work output/work input) × 100%

work input = 350 joules, efficiency = 65.1%

Work output = 350 j × 65.1/100

                    = 227.85

                    ≈ 228 Joules

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.