[填空题]
What is the linear sp;m,bo5vld/+ 4 dp ig23 yljiwteed of a pointchq0bgs* ( t( lw(d8rt (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? $m/s$