Why Is Tension T=2mg and Not T=mg at Time t=τ?

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SUMMARY

The tension in the system is determined to be T=2mg at time t=τ due to the dynamics of the mass m falling from the massless rod attached to a cart shaped like an equilateral triangle. As the mass m descends, it generates a radial force expressed as mv²/L, which must be balanced with the tension force. At the moment when the rod becomes parallel to the ground, the gravitational force acting on the mass m contributes to the tension, resulting in T=2mg rather than T=mg.

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A massless rod of length L attached to mass m and with axle to cart of mass M. The cart has a shape of equilateral triangle (edge L). the cart is at rest and its center of mass is above x=0 and a rod is perpendicular to the ground. the cart is free to move without friction. at time t=0 the mass m is released and starts to fall to the left. at time t=τ the rod is parallel to the ground. Why the tension from the stick at time t=τ is T=mv^2/L=2mg and not T=mv^2/L=mg?
 

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What do you think?
Any relevant equations?
Any ideas of you?
 
mv^2/L is the radial force that need to be equated with the tension force...but the torque mgsin 90 = mg
 
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