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Q.

Is it true that the angle between force and displacement for minimum work should be θ=90°?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
Given angle is 90o.
= F×s×cos θ----(1)
We know that cos 90=0o
Substitute cos 90=0o in the formula given in the equation (1).
W= F × s × 0
W=0
Therefore work done is 0 when the angle between the force and the displacement is 90o
 
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