work done by puller person
= F * 28
work done lifting weight
= .47 * F * 28 = 13.16 F
so
13.16 F = 47 * 9.81 * 7
The efficiency of a pulley system is 47 percent.
The pulleys are used to raise a mass of 47 kg
to a height of 7.0 m.
The acceleration of gravity is 9.81 m/s
2
.
What force is exerted on the rope of the
pulley system if the rope is pulled for 28 m in
order to raise the mass to the required height?
Answer in units of N.
1 answer
1 answer