A 5kg metal block is taken to four different locations:
(a) a point on the Earth’s surface at sea level and latitude 60∘ N,
(b) the top of a mountain 5km above sea level at the Equator,
(c) a mine shaft 3km below sea level at the Equator, and
(d) the surface of the Moon.
a. (i) Arrange the locations in order of decreasing weight of the block, writing the corresponding letters only.
b. (ii) Give a brief reason for the position of each location in your ordering.