衡中同卷信息卷2023全国卷(二)历史试卷 答案(更新中)

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四、应用文写作One possible version:Dear Charles,Recently our class has been busy preparing Hamlet forthe Drama Competition to be held next month.I'd like toinvite you to come to our classroom at ten this Saturdaymorning and offer your guidance on our performance.Iwould also appreciate it if you could share your valued opin-ions on our costumes,acting skills,onstage light and soundeffects.Of course,any suggestions are highly appreciatedand we will make proper adjustments accordingly.I'm looking forward to your coming.Yours sincerely,Li Hua

【答案】(1)2.5m/s212.5m/s2(2)10m自新映客大是的水及【解析】(I)小物块在长木板上滑动时，对小物块有mg cos0十mg sin0=ma1(1分)解得a1=12.5m/s2(1分)对长木板，由牛顿第二定律有Mg sin 0-umg cos 0=Ma2(1分)解得a2=2.5m/s2(1分)(2)设当小物块与长木板共速时的速度为1，有v1=a1t1=v0十a2t1(1分)解得t1=1s,v1=12.5m/s:特粮共速后，小物块与长木板保持相对静止，一起向下做匀加速运动，则共速前物块与木板的相对位移为00十v1v1十0女好中门球测的京包府少茶一一的用图成T话画部装△x=2126(1分)解得△x=5m(1分)故长木板长度至少为10m(1分)