问题
问答题
某行星与地球的质量比为a，半径比为b，该行星表面与地球表面的重力加速度比为______．
答案
根据万有引力等于重力G
=mg得，g=Mm R2
，知重力加速度与中心天体的质量和半径有关，所以GM R2
=g1 g2 a b2
故答案为：a：b2
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某行星与地球的质量比为a，半径比为b，该行星表面与地球表面的重力加速度比为______．
根据万有引力等于重力G
=mg得，g=Mm R2
，知重力加速度与中心天体的质量和半径有关，所以GM R2
=g1 g2 a b2
故答案为：a：b2
| 完型填空。 | ||||
| My father __1__ a good friend in the factory (工厂). He is sixty. He is an old man. All of the children like him. We call __2__ Uncle Sam. He __3__ from England. He __4__ in Sichuan. He can't __5__ Chinese. We teach him __6__. He __7__ us English. He __8__ work on Sundays. He __9__ making things. And he likes watching TV __10__ his children at night. | ||||
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