- #1
Vibhor
- 971
- 40
Homework Statement
Homework Equations
The Attempt at a Solution
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Initially the rod is in rotational equilibrium , so net torque about CM is zero .
From torque equation about CM , we get
Tension T in the left string = Force F (kx) in the spring
Doing a force balance gives us T+F=Mg
2F=Mg
F=Mg/2
Now when the string is cut , force equation in vertical direction is Mg - F = Ma
Torque equation about the CM is F(L/2) = (ML2/12)α
F = Mg/2 since force exerted by spring remains same just after right string is cut .
Using value of F in the above two eqs gives a = g/2 and α = (3g/L)
Have I approached it correctly ?