Giancoli Question $11\mathrm{.}1$:

If there were a great migration of people toward the Earth$$s equator, would the length of

the day $($a$)$ get longer because of conservation of angular momentum; $($b$)$ get shorter because

of conservation of angular momentum; $($c$)$ get shorter because of conservation of energy; $($d$)$

get longer because of conservation of energy; or $($e$)$ remain unaffected?

$2$