
The input work done to lift a

Answer to Problem 67A
Explanation of Solution
Given:
The efficiency of the given lever machine,
The mass to be lifted,
The distance by which the mass is to be lifted,
Formula used:
Work done is given by,
Where
And, the efficiency if given by,
Where
Calculation:
Now, the weight of the mass that is to be lifted is,
Thus, the force required to pull the mass is
And, the angle between this force and the displacement is
Thus, the output work done is given by,
Then, the efficiency of the given lever can be written as,
Conclusion:
Thus, the input work done is
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