Question

Plz help answer this question

Answer 1

For an inclined plane, the mechanical advantage is calculated by,

M.A = (length of the incline)/(Height of the incline)

As the efficiency is 70%, we get

M.A =
`(70)/(100)*(10)/(3)`

=7/3

Force required to lift the load of 60 kg = Weight of the object/M.A

=
`(60*9.8)/(7/3)`

=252 N

To decrease the amount of effort, we can increase the length of the incline without changing its efficiency.