2023江西省吉安一中高三上学期11月期中考试文数答案
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2023江西省吉安一中高三上学期11月期中考试文数答案试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有
10CD【解析】带电小球从a点射入场区,并在竖直平面内沿直线运动至b点,则小球一定做匀速直线运动,只要满足合外力为零即可,小球可能带正电,受到电场力的方向可能水平向右,也可能沿其他方向;小球可能带负电,受到电场力的方向斜向左上方,A、B错误,D正确;从a到b的过程,由于合外力做功等于零,重力做正功.洛伦兹力不做功,所以电场力一定做负功.C正确。故选CD
(2+√217.(1)R(2)(2+√2)m(3)m2≥-(2+√2)m【解析】(1)静止时弹簧与竖直方向成45°角,对小圆环进行受力分析,如图甲所示。根据平衡条件,弹簧的弹力(1分)cos45根据几何关系,弹簧的伸长量△x=(√2-1)R(1分)根据胡克定律得F=k(1分)解得k=(2+√2)mg(2分)(2)设静止时弹簧与竖直方向成0角,小环上挂的物体质量为m1,对小圆环进行受力分析,受到物体的拉力m1g、弹簧的拉力F′、大圆环的弹力Fx,作出三个力的m1g、弹簧的拉力F、大圆环的弹力FN,作出三个力的矢量三角形.如图乙所示乙根据几何知识,力的矢量三角形和实物三角形AOB相似,而OA和OB都等于R,所以m1g和FN始终相等AB=2Rcos6(1分)F"=2m1gcos日(1分)弹簧的伸长量Ar=2Rcos0-R=(2cosb-DR分根据胡克定律得F=k△x(1分)WIV6COs4≈(2+√2)mg,(2cos6-1)R(2分)R
8.D从实验数据可以看出,有土壤的瓶子温度上升快,没有土壤的瓶子温度上升慢。下垫面不同,大气的温度相差很大,设计这一实验是为了证明下垫面是大气的直接热源
9.A若向两瓶中加入等量的二氧化碳,甲瓶升温更明显,原理是二氧化碳强烈吸收地面辐射,使大气增温甲瓶中的二氧化碳增强大气逆辐射,使地面增温;与臭氧层没有关系;乙瓶中的二氧化碳强烈吸收太阳辐射使大气增温不明显
10.B梯田上部的森林具有良好的水源涵养功能,可增加下渗,增加地下径流
11.C从图中可以看出,紫鹊界梯田地下储水丰富,独特的水利灌溉工程保障干旱时期农田供水充足
12.B据材料可知,采样装置面向阳光的一侧亮度大,而背向阳光的一侧漆黑一片,主要原因是月球质量小,引力小,无大气层,无大气对阳光的散射作用;面向阳光的一侧亮度大,说明并不是夜间采样;与大气逆辐射关系不大,且月球无大气层,不具备大气逆辐射;月面温度较高,月面辐射强
读后续写Possible version lI stared at the paper and then looked around. I was cold. Although I could not see my sistersnor the new house, which was hidden from my sight by a grey wall, I got the feeling that I was notalone. Walking along the shore was a tall familiar figure who looked lost in his thoughts. I lookedgain at the paper in my hand, closed my eyes and wishedAs /opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. I smiled up at him and took his hand. Looking back, life fromthat day on marked the start of a close bond and a strong friendship with my father. What was mybirthday surprise? Wishes do come truePossible version 2I stared at the paper and then looked around. On the backside, there was a map. I noticed thatit was clearly leading me in a direction, but who could have sent this? I stood there in silence andstudied it. I decided to follow the map and it led me down the beach until I reached a staircase. Iooked back and could no longer see my siblings. I continued to follow the point on the map, untilI unexpectedly lost my footing and fell zksq down the stepsAs I opened my eyes, I found my father was standing right beside me. Happy birthday, sonhe said, patting my shoulder gently. Then he asked how I had come upon this place? I explained tohim that I had found the bottle in the ocean and when I opened it had the words on it. Shocked bythe message, my father realized what I had found I threw this bottle into the ocean many years agowhen I was alone. he said. I used to come to this exact place to get away from everyone else. NowI get to share this experience with you. What a birthday surprise
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