[填空题]
What is the linear speedrayz, +sy-5i h6 gy-qz ofnc usya4ogx(hun 3.40a 1v .rp/xo5p d 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? $m/s$