[填空题]
Calculate the centri rilqnyi:izt5;t3n48 -0qyq qpetal acceleration of the Earth in i6,5vi pvm; lkv;;1an nvr x)iits orbit around the Sun, anv;xm15ikn ip,) irn;vavl ;v6d the net force exerted on the Earth. What exerts this force on the Earth? Assume that the Earth's orbit is a circle of radius 1.50$ \times 10^{11} \mathrm{~m}$ . [Hint: see the Tables inside the front cover of this book.] $\times10^{22}$
