IIT JEE , AIEEE Forum - Physics , Mechanics

varun.tinkle

A SMALL HEAVY BOCK IS ATTATCHED TO A LIGHT ROD OF LENGTH l WHICH CAN BE ROTATED ABUOT ITS CLAMPED UPPER END.WHAT MINIMUM HORIZONTAL VELOCITY SHOULD BE GIVEN SO THAT IT MOVES IN A COMPLETE CIRCLE

ANS UNDER ROOT 4GL

MY STEP IS THAT THE BLOCK MOVES IN A CIRCLE OF RADIUS l SO AT THE TOPMOST POINT MV^2/L=MG

V^2=LG

THE POTENTIAL ENERGY IS 2MGL

SO

1/2MV1^2=1/2MV^2+MGH

SOLVING IT WE GET V

AS UNDER ROOT 5LG

BUT THE ANSWER IS WRONG

PLS EXPLN THE FLAW IN MY WORKING

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