[填空题]
Calculate the centripetal acceleration of the E h* zpib 1*uvixim)35narth 1)tfdwykcgj*(/3kszv +0o 9vb gl 0zvin its orbit around the Sun, and the net force g+oz09k0vvgysdt/1( c) wzk v*jl b 3fexerted 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.] $\times10^{22}$
