A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distant from the hinges for opening or closing the door is:

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1.2 N

3.6 N

2.4 N

4 N

answer is D.

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Detailed Solution

τ1=τ2⇒(1)(1.6)=F(0.4)⇒F=4N

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