- #1
Saptarshi Sarkar
- 99
- 13
- Homework Statement
- A thin massless rod of length 2l has equal point masses m attached at its ends (see
figure). The rod is rotating about an axis passing through its centre and making angle θ with it. What is the magnitude of the rate of change of its angular momentum?
- Relevant Equations
- ##L=Iω##
##τ=Iα=\frac {dL}{dt}##
I calculated the total moment of inertia of the system to be ##2ml²Sin²θ##, so the angular momentum is ##2ml²ωSin²θ##.
To get the torque on the system I need to differentiate the angular momentum but I don't have any time dependent terms. What should I do?