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Alcatrez

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Thread moved from the technical forums, so no Homework Template is shown

A uniform rod of mass m and length l is pivoted at a point on the ground. The rod is initially in vertical position and touching a block of mass M which is at rest on a horizontal surface. The rod is given a push of negligible force and it starts rotating about that point. This causes the block to move forward. The rod loses contact with the block at θ = 30° with horizontal. All surfaces are smooth.

Find M/m

I have conserved the energy, found a relation of

w² = -(alpha)(tantheta)

by considering x=Lcostheta and double differentiating to get a.

I am getting a correct ans of 4/3 but i had considered alpha (ang acc) to be negative which isn't correct, right?

What's wrong with this?

Find M/m

I have conserved the energy, found a relation of

w² = -(alpha)(tantheta)

by considering x=Lcostheta and double differentiating to get a.

I am getting a correct ans of 4/3 but i had considered alpha (ang acc) to be negative which isn't correct, right?

What's wrong with this?

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