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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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a
1.2 N
b
3.6 N
c
2.4 N
d
4 N

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detailed solution

Correct option is D

τ1=τ2⇒(1)(1.6)=F(0.4)⇒F=4N


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