Question

Calculate the period of a pendulum of Length = 2m.
a) on the earth
b) on the moon

Answer 1

the peroiod of a pendulim it's given by:
\[T=2 \pi \sqrt{\frac{l}{g}}\]
so you just have to replace the values for l and g in each case

Answer 2

well, in both cases, the length is the same, but the value of g changes for the earth and the moon