1. A worker uses a board that is 4 m long to pry up a boulder. A small rock is used for a fulcrum and is placed 0.5 m from the resistance end of the lever. Calculate the MA of the
I
board.

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 from the fulcrum and the mass at the other end of the lever is from the fulcrum.

So, mechanical advantage is given by

So, mechanical advantage of the board is 7.

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