## 2 thoughts on “5.30”

1. lkgarner says:

During the energy conservation solution, the final simplification before taking the derivative appears to be missing the 'm' term for '-2rdsin(theta)(theta_dot)^2'.

1. tutorpaul says:

Right you are! That term should include mass: $-2rdm\sin(\theta)\dot\theta^2$

Also, the final answer should include the mass as well: