[填空题]
What is the linear spp oce6q e7whm: 01 4(x;k7wtwng3yonu 4 dlv9un8gc)aq2syev7j( k6peed 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? $m/s$