IIT JEE , AIEEE Forum - Physics , Mechanics

joyfrancis

Hi.

It is a kind of modified version of an HC verma problem 12 pg79.

We have to show that as the man in the ditch is pulled up the force exerted on the other two men increases...which is true.

See,

take the angle made by the rope connecting the man in the ditch and anyone of the other two and the horizontal be @.

Now as the man is pulled up the rope starts becoming horizontal(when it is perfectly horizontal the man would be out)....i.e the angle@ is DECREASING.

Now if we take tension along the rope connecting the man in the ditch and anyone of the other two to be T then the force on the other man is Tcos@.

Obviously if @ is decreasing cos@ would increase

.:the force exterted on the two men would increase as the man is pulled up.

As for the second part, i am getting the following answer.

Force exerted when he is at a depth d = 5mg/4d

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