A fire tongs has its arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at distance 15 cm from the fulcrum. Find the mechanical advantage of fire tongs.

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0.75

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0.25

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Solution

The correct option is B
0.75

Effort arm = 15 cm

Load arm = 20 cm

Mechanical Advantage = $\frac{E f f o r t a r m}{L o a d a r m}$

= $\frac{15}{20}$ = $\frac{3}{4}$ = 0.75

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