[填空题]
What is the linear sv 1ip-qlke: hw u2ouf(p48ale .n3tb5peef am2wl c7+*g n8v6ddc).dqn3dhm)ns d 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? $m/s$