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A door 1.6 m wide requires a force of 1 ...

A door 1.6 m wide requires a force of 1 N to be applied at the free and 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

A

1.2 N

B

3.6 N

C

2.5 N

D

4 N

Text Solution

Verified by Experts

The correct Answer is:
D
`tau` required to open/close the door will remain constant
`r_(1) xxF_(1)=r_(2)xxF_(2)`
`1.6xx1=0.4xxF_(2)rArrF_(2)=4N`.
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