2022八年级新目标英语周报25期答案

17.(10分冮解析】小球在傾斜軌道上从A点运动到B点,由动能定理有mohsin37=ym-0……………(1分)四=2√6m/s…………………………(1分)(2)①小球恰好过竖直轨道最高点时有mg=mR……………………………(1分)小球由B到圆轨道最高点运动,由动能定理有:gongLi-mg·2k=2mn~mt………(1分)联立代入数据得L1=0.2m(1分)②小球恰好能到达竖直圆軌道最右端时有pomgLa-mgr=o-mIva(1分)联立代入数据得L2=2m(1分)③小球恰好能运动到C点时,由动能定理有pgla=0-amh(1分)解得Ls=3.2m(1分)要使小球不脱离轨道,L应满足0

第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a deepbreath. I saw two young men in canoes, racing each otherI was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When I woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded mefor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

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