Question

You apply a force of 567 N to push a boo shelf up 2.3 m long ramp. a.How much work in joules have been done when you reap the top? b. If lifting the booksehlf requires 2000 N of force, what is the mechanical adavantage of the ramp?

Answer 1

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(i) Given : l=7.5m,h=2.5m.

Mechanical advantage (M.A.) =

h

l

=

2.5

7.5

=3

(ii) M.A. =

Effort

Load

Effort =

M.A.

Load

=

3

1500

Effort =500N.

(iii) In actual practice, due to some friction between the plane and the bottom face of the body which is pulled over it, the effort needed is certainly more than Lsinθ, so the mechanical advantage is always less than l/h, hence, efficiency is less than 1.

Answer 2

Answer:

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