IIT JEE , AIEEE Forum - Physics , Mechanics - "WAVE MOTION-1"

prateek.agarwal

seems simple...but just can't solve it...

KAB

Let the mass be placed at a distance x from the left end.

Let the tension in the left string be T₁ and tension in the right string be T₂.

Now taking moments about the left end,

48x+12*0.2=T₂*0.4....(1) (Since weight of the rod acts at the midpoint of the rod.)

Taking moments about right end,

48(0.4-x)+12*0.2=T₁*0.4......(2)

Also given f=1/2Lroot(T₁/m)=2/2Lroot(T₂/m)

So T₁=4T₂.....(3)

Solve (1),(2) and (3) you will get x=5cm

So the mass should be kept at a distance of 5cm from the left end.

prateek.agarwal

man...KAB u r so intelligent...rating u,,,