Question

The adjacent Fig. 3.27
shows a fixed pulley used
by a boy to lift a load of
400 N through a vertical
height of 5 m in 10 s. The
effort applied by the boy
on the other end of the
be
rope
is 480 N.
480 N
(a) What is the velocity
ratio of the pulley ?
400 N
(b) What is the mechanical
Fig. 3.27
advantage ?
(c) Calculate the efficiency of the pulley.
(d) Why is the efficiency of the pulley not 100%?
(e) What is the energy gained by the load in
10 s?
(f) How much power was developed by the boy
in raising the load ?
(g) The boy has to apply an effort which is
greater than the load he is lifting. What is the
justification for using the pulley ?
When the effort moyes a distance d downwards, the
So
2. THE​

Answer 1

Answer:

hii so I hope my answer helps

Explanation:

3p4q hi ri hi ri hi ri

x + y = 21

21-x=y

these are the equation

solve themmm