Answer:
(i) The motion of an artificial satellite around the earth is periodic as it repeats after a regular interval of time. But it cannot be taken as S.H.M. because it is not a to-and-fro motion about any mean position. (ii) Time period of simple pendulum, \[T=2\pi \sqrt{\frac{l}{g}}\] i.e., \[T\propto \sqrt{l}\] Clearly, if the length is increased four times, the time period gets doubled.
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