[填空题]
What is the linear spqsf9c -;yp gd)eed oi1;kk-x*cs 7 -ynlpso2(lva+f pm z /jf 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? $m/s$