2022届先知新课标模拟卷(一)语文试题答案

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(1)当为=10R时，小滑块由A到D的过醒，由能量守恒，弹簧被压墙到A点时的弹性势能：25.(20分)E,=2mgR+mg·10R=(:+10)gR(2分)(2)当A=8R时，设小滑块到达D点时的速度大小为？，由能量守恒：E,=mgR+g·8R+号2分)设机道对小得块的作用力为尸，由牛领第二定律+F一景1分)底立解得：F一3mg,方向竖直向下。(2分)③设背块从D点平范的初速度为，则：mg10R-A)=言1分)若平抛恰好经过F点，则有：这=：(1)-R-(1分)联立解得：=4(h一5R)(10R一h)(2分)(4)由(3)可知，滑块恰好通过F点时满足：(4,3R)=4(h一5R)(10R一h),解得A,=4R,h:=8R(1分)当A,=4R时，由mg(10R一h)=。mi,h,-78听n-1·解得：x:=4,6R(1分)同理可解得，当，=8R时，x:=8R(1分)若无指板，则g10R-,)=专m=方8=解得：x0=2√A(10R-万，当A,=5R时，落地距离最远为x=10R(1分)当，=5R,x=45R时，滑块的下营药度)一宁：宁八解得：y=2.4R<5R一2R故，所求范周为：8R≤rm≤10R(2分)

第二节读后续写（满分25分）One possible version:A few minutes later,she heard a crash."Clay?"Sheleaned forward,craning her neck to see what had hap-pened.It was Clay who was calling for help from deep with-in the crater!He spoke in such a faint voice that she couldhardly recognize it.Amy immediately dialed the phone forhelp,but it was disconnected.Anxious about Clay'ssafety,Amy grabbed a rope and began to climb down torescue Clay without hesitation.Finally she spotted Claythrough the tree,only to find he was bleeding from the backof his head.There was only one thing to do:She needed to draghim out somehow.Putting Clay's arm over her shoulder,Amy shakily carried him along.Inch by inch,step by step,they climbed.After what couldn't have been more thanhalf an hour but felt like forever,they eventually reachedthe top.Luckily,they came across two hikers passing by.The hikers hurriedly came forward,helped wrap Clay'shead and carried him to the hospital.Thanks to theirefforts,Clay gradually recovered.Their wedding vow "insickness and in health"indeed became a promise for a life-time.