[填空题]
What is the linear sv2z*/z 6i knw8i4xkzrpeed of a pcyzp* +; qhfn)4xwxk;l ;a ,iooint (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? $m/s$