2022高一课标英语周报第27期答案

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

18.【解析】(1)设可见星A和暗星B做圆周运动的轨道半径分别为n1、r2,由题意知,可见星A和暗星B做匀速圆周运动的角速度相同,均为。由牛顿运动定律有FA=m12n1,FB=m22r2,FA=FB(2分)设可见星A和暗星B之间的距离为r,又r=n1 r2(1分)由上述各式得r(2分)由万有引力定律有FA=Gm2,将上式代入得FA.G(m tmdr(2分)又F解得(m1 m2)(2分)x由牛顿第二定律有m1m2=m2(2分)又可见星A的轨道半径r1(1分)联立可得(m1 m2)22nG(2分

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