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全國100所名校單元測試卷地理卷五
18.(03,(3)13R【命題意圖】本題以帶電小球在復(fù)合場中的運(yùn)動為背景,,考查受力分析,、圓周運(yùn)動、類斜拋運(yùn)動,、動能定理等,,意在考查考生的模型建構(gòu)能力和推理論證能力?!窘馕觥?1)小球在沿軌道AB下滑的過程中,,壓力傳感器的示數(shù)始終為0,,對小球進(jìn)行受力分析,有g(shù)E=m3(1分)tan 03mg解得E=49(1分)(2)當(dāng)壓力傳感器的示數(shù)最大時(shí),,小球位于所受電場力和重力合力方向背離圓心的位置G,如圖所示,,則在小球從A點(diǎn)運(yùn)動到G點(diǎn)的過程中,根據(jù)動能定理有器,?!?=之m(2分)sin 0在G點(diǎn),根據(jù)牛頓第二定律有場(2分)由牛頓第三定律有FN=FN(1分)解得壓力傳感器的最大示數(shù)P以-空g(1分)》D壓力感2器(3)在小球從A點(diǎn)運(yùn)動到C點(diǎn)的過程中,,根據(jù)動能定理有(2R+Rsin(1分)sin 0小球運(yùn)動到C點(diǎn)后做類斜拋運(yùn)動,,垂直于軌道CD方向由牛頓第二定律有m-=ma(1分)sin 0設(shè)小球從離開C點(diǎn)到第一次與軌道CD碰撞經(jīng)歷的時(shí)間為t,垂直于軌道CD方向有-U1cosB=1cosB-at1,沿軌道CD方向有x1=v1sinB·t1,令6-公,則第二次與軌道D碰撞前,。垂直于軌道CD方向有-kv cos B=kv cos B-at2,沿軌道CD方向有x2=visin B·2,由分析可知,,第n次與軌道CD碰撞前,垂直于軌道CD方向有-kVICos B=k"-v cos B-at(1分)沿軌道CD方向有xn=U,sinB·t,(1分)則x=x1+x2+x3+…+xn=2vsinβcosB,1-k"a1-k(2分)當(dāng)n→∞時(shí),,小球緊貼軌道CD垂直打在擋板P上,,解得x=13R(2分)
20全國100所名校
第一節(jié)One possible version:Dear Michael,A Chinese Kungfu performance is going to be staged inour school stadium at 8:00 p.m.next Friday evening.Learning that you are interested in Chinese culture,I'mwriting to invite you.Chinese Kungfu,a traditional sport,has a long historyand is regarded as our national treasure.It is a means ofself-defense and it can also enhance people's physicalfitness.So far,Chinese Kungfu has attracted numerousfans both at home and abroad.Several Kungfu masters willbe invited to perform,which is sure to make it splendid.Looking forward to your reply.Yours,Li Hua
標(biāo)簽: 全國100所名校示范卷21g3dy 全國100所名校英語卷八 全國100所名校卷官網(wǎng)語文
還木有評論哦,,快來搶沙發(fā)吧~