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

A door 1.6 m wide requires a force of 1N to be applied at the free and to open or close it. The force that is required at a point 0.4 m distance from the hinges for o[ening or closing the door is

A

1.2 N

B

3.6 N

C

2.4 N

D

4 N

Text Solution

Verified by Experts

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