2022英语周报七年级六版答案

11.【解析】(1)根据电场方向和小球受力分析可知小球带正电(2分)小球由A点释放到速度等于零,由动能定理有0=EqLsin a-mgL(1-cos a)(2分)解得E=(2分)(2)如图所示,将小球的重力和电场力的合力作为小球的等效重力G,则G=2mE,方向与竖直方向的夹角为30°,偏向右下(2分)若小球恰能做完整的圆周运动,在等效最高点有ok=m(3分)小球从A点以初速度υA运动,由动能定理有1m2-1m=-26mE3(1 co30°)(2分)联立解得A=√2(3 1)gL(2分)

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

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