[填空题]
During a lunar eclipse, the Moonwnee)mix ) , pzj.ek::, Earth, and Sun allj3qk ,hp92fhg lie on the same line, with the Earth between the Moon anhgq9p2 h3fk,jd the Sun. The Moon has a mass of $7.36 \times 10^{22} \; kg$; the Earth has a mass of $5.98 \times 10^{24} \; kg$; and the Sun has a mass of $1.99 \times 10^{30} \; kg$. The separation between the Moon and the Earth is given by $3.84 \times 10^{8} \; m$; the separation between the Earth and the Sun is given by $1.496 \times 10^{11} \; m$.
(a) Calculate the force exerted on the Earth by the Moon, its magnitude is $\times 10^{20} \; N$, its direction is the moon.
(b) Calculate the force exerted on the Earth by the Sun, its magnitude is $\times 10^{22} \; N$, its direction is the Sun.
(c) Calculate the net force exerted on the Earth by the Moon and the Sun, its magnitude is $\times 10^{22} \; N$, its direction is the Sun.
参考答案: 空格1: 1.99±3%
空格2: towards
空格3: 3.55±1%
空格4: towards
空格5: 3.53±1%
空格6: towards
