[填空题]
What is the linear spee zw3 4qj hw(juq81e)bt39h +le4eoqnlvi2k;+f ug;7xe* uoped of a point
(a) on the equator, $m/s$
(b) on the Arctic Circle (latitude 66.5$^{\circ} $ N), $m/s$
(c) at a latitude of 45.0$^{\circ} $ N, due to the Earth’s rotation? $m/s$