Question

d form of 32 A pulley is used to lift a load of 180kgf by applying an effort of 90kgf in the downward direction. Calculate the work done by the effort applied on the pulley. (a) 2] (b) 12) (C) 6] (d) 24J er
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Answer 1

Answer:

Explanation:

Workdone = force × distance

 

In the given question we do not the distance moved either by load or effort.

Answer 2

Given: A pulley is used to lift a load of 180 kgf by applying an effort of 90 kgf in the downward direction.

To find: The work done by the effort applied on the pulley.

Solution:

• A pulley is a simple machine, a wheel-like object with a groove around it through which a string passes. The effort applied on the string through a pulley helps to lift heavy objects.
• The given pulley must be a fixed pulley and that is why the effort is applied in the downward direction.
• Work done by a pulley is calculated using the following formula.

        $W = \frac{L}{E}$

• Here, W is the work done by the pulley, L is the load acting on the pulley and E is the effort applied on the pulley.

        $W = \frac{180 kgf}{90kgf}$

             $= 2J$

Therefore, the work done by the effort applied on the pulley is 2 J.