Question

2. A fixed pulley is driven by a 100 kg mass falling at
a rate of 8.0 m in 40 s. It lifts a load of 75.0 kgf.
Calculate :
(a) the power input to the pulley taking the force of
gravity on 1 kg as 10 N.
(b) the efficiency of the pulley, and
(c) the height to which the load is raised in 4-0 s.​

Answer 1

Answer:

Explanation:

Given that,

Mass m = 100 kg

Distance d = 8 m

Time t = 4 sec

Load F= 75 kgf

The effort is 10 N for 1 kg.

So, The effort will be for 100 kg = 1000 N

Load will also be 750 kg.

(a).

The power(P) will be

(b).

The efficiency will be

Hence, The power and efficiency will be 2000 w and 0.75.