A wheel and axle have radii 80cm and 10cm respectively. I...
A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200N to the wheel will raise a load of
8.0N
6.8N
8160N
9600N
Correct answer is C
Efficiency = m.A x 1V.R x 100%
85 = load1200 x 1080 x 1001
load = 8160N