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【答案】(1)BC(2分)(2)1.5(2分)0.2(2分)0.3(2分)【解析】(1)由于小球每次都从同一位置由静止开始运动,到达斜槽末端速度相同,与斜槽是否光滑无关,A错误;由于本实验研究平抛运动,因此斜槽槽口切线必须水平,B正确:调节纸板,使纸板面竖直且与小球运动轨迹所在平面平行,以便于在白纸上描点,C正确;画平抛运动轨迹时,将小球放到槽口末端,球心在纸板上的水平投影作为平抛运动的起,点,D错误。(2)由于平抛运动在水平方向做匀速运动,又AB与BC水平距离相等,因此时间间隔相等,在竖直方向上,根据△y=gT2得,相邻两点间的时间间隔T=(5-3)X5×10-210s=0.15,因此抛出的水平速度大小为0=下3X5X10m-1.5m/s:运动到B点时的竖直速度大小为0=y4,yc=3+5)X5X102m=2m/s,0.1s2T0.2sV,=g,因此小球从槽口抛出到运动到B点所用的时间1=四=02s:B点离槽口的水平距离工=U,t=0.3m。
对自己以后的生活很有用。【解析】When I was little,Friday's night was our family game night.Friday表示“周五晚上”,直接用名词作定语After supper,we would play card games of all sort in the sittingsorts前有ll修饰,用可数名词复数room.As the kid,I loved to watch cartoons,but no matter howa泛指“一个孩子many times I asked to watching them,my parents would not ta letwatchask to do sth."要求做某事"情态动词后面跟动词原形me.They would say to us that playing card games would help myme此处指“我brain.Still I A unwilling to play the gamesfor them sometimes.waswithbe unwilling to do sth.“不愿做某事",play with sb.描述过去发生的事,且主语是单数“和某人一起玩I didn't realize how right my parents are until I entered highwere由didn't和entered可知此句时态为一般过去时school.The games my parents taught me where I was a child turnedwhen表示“父母在我孩提时教我的游戏”,用whn引导时间状语从句out to be very useful later in my life.一士

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