Question

1. A worker uses a board that is 4 m long to pry up a boulder. A small rock is used for a

Answer 1

Answer:

7

Explanation:

Mechanical advantage is given by the ratio of the distance of the fulcrum from the two objects of the system.

Here the boulder is $0.5\ \text{m}$ from the fulcrum and the mass at the other end of the lever is $4-0.5=3.5\ \text{m}$ from the fulcrum.

So, mechanical advantage is given by

$MA=\dfrac{3.5}{0.5}\\\Rightarrow MA=7$

So, mechanical advantage of the board is 7.