Pendulum problem:
An elephant has legs that stretch 2.3 m from its shoulders to the ground. How much time is required for one leg to swing forward after completing a stride?

Question

Pendulum problem: 
An elephant has legs that stretch 2.3 m from its shoulders to the ground. How much time is required for one leg to swing forward after completing a stride?

anonymous · Answer

I tried the equations:
$$2*\Pi*\sqrt{\frac{ L}{ g }}$$
and
$$2\pi \sqrt{\frac{ L }{ 3g }} $$ but none of those seem to work.

ksaimouli · Answer

$$T = 2(\pi)\sqrt{(L/g) }$$ this should work

ksaimouli · Answer

$$\frac{ 2\pi }{ \sqrt{\frac{ 2.3 }{ 9.8 }} }$$

anonymous · Answer

I figured it out. This problem represents a physical pendulum and has to factor in inertia of the leg. So the proper equation to use is $$\frac{ 1 }{ 2 \pi }\sqrt{\frac{ 3g }{ 2L }} $$