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“小喵喵”2027届高三第一次模拟考试物理(新高考I卷)

  • 2026-10-29 06:27:27

“小喵喵”2027届高三第一次模拟考试

物理(新高考I卷)

满分:100分  考试时长:75分钟

1、某物体做匀变速直线运动,初速度$v_0=4\mathrm{m/s}$,经过$t=2\mathrm{s}$后速度变为$v=8\mathrm{m/s}$,则物体的加速度大小为()A.$1\mathrm{m/s^2}$  B.$2\mathrm{m/s^2}$  C.$4\mathrm{m/s^2}$  D.$6\mathrm{m/s^2}$

2、质量为$m$的小球,从高度$h$处由静止自由下落,不计空气阻力,重力加速度为$g$。落地瞬间小球的动能为()A.$mgh$  B.$\dfrac12 mgh$  C.$2mgh$  D.$mg\sqrt{2h/g}$

3、真空中两个点电荷相距$r$,相互库仑引力大小为$F$。若两点电荷距离变为$2r$,电荷量均保持不变,则相互作用力大小为()A.$2F$  B.$F/2$  C.$4F$  D.$F/4$

4、理想变压器原线圈匝数$n_1=2000$匝,副线圈匝数$n_2=200$匝,原线圈接入有效值220V交流电,则副线圈输出电压有效值是()A.$2200\mathrm{V}$  B.$220\mathrm{V}$  C.$22\mathrm{V}$  D.$2.2\mathrm{V}$

5、一个质点做匀速圆周运动,轨道半径$R$,线速度大小$v$,质点的向心加速度大小为()A.$vR$  B.$v^2/R$  C.$v/R$  D.$vR^2$

6、如图,水平面上物体质量$m=2\mathrm{kg}$,受到水平拉力$F=10\mathrm{N}$,动摩擦因数$\mu=0.4$,$g$取$10\mathrm{m/s^2}$,物体加速度为()A.$1\mathrm{m/s^2}$  B.$2\mathrm{m/s^2}$  C.$3\mathrm{m/s^2}$  D.$5\mathrm{m/s^2}$

7、关于分子动理论,下列说法正确的是()A.布朗运动就是分子本身的运动B.温度越高,分子平均动能越大C.气体压强由分子重力产生D.分子间引力和斥力不会同时存在

8、一束单色光从空气射入玻璃,下面说法正确的是()A.频率不变,光速变小B.频率变小,光速不变C.频率不变,光速变大D.频率变大,光速变小

9、(多选)竖直上抛一小球,不计空气阻力,下列描述正确的是()A.上升与下落同一高度,速度大小相等B.上升过程加速度向上,下落加速度向下C.上升时间等于下落回抛出点时间D.到达最高点速度为零,加速度不为零

10、(多选)磁场中一段通电直导线,导线与磁场垂直,安培力$F=BIL$,下面说法正确的是()A.$B$是磁感应强度,由磁场本身决定B.电流增大,磁感应强度$B$变大C.导线长度变长,磁感应强度$B$不变D.安培力方向同时垂直电流方向与磁场方向

11、(多选)简谐振动的弹簧振子,下列说法正确的是()A.振子在平衡位置,回复力等于0B.振子离平衡位置最远时,速度最大C.周期只和弹簧劲度系数、振子质量有关D.最大位移处,弹性势能最大

12、(多选)热力学第一定律$\Delta U=Q+W$,下面说法正确的是()A.气体对外做功,$W$取负值B.气体吸收热量,$Q$取正值C.等温膨胀理想气体,内能不变D.绝热过程,$Q=0$,内能变化只由做功决定

13、(5分)某单摆摆长$L=1.0\mathrm{m}$,重力加速度$g=9.8\mathrm{m/s^2}$,单摆周期$T=$________s。(保留两位小数)

14、(5分)阻值$R_1=4\Omega$与$R_2=6\Omega$两个电阻串联,总电阻等于________$\Omega$。

15、(5分)质量$m=0.2\mathrm{kg}$的子弹,以$v_0=500\mathrm{m/s}$打入静止木块,子弹留在木块内,共同速度$v=100\mathrm{m/s}$,木块质量为________$\mathrm{kg}$。

16、(5分)面积$S=0.02\mathrm{m^2}$线圈垂直匀强磁场放置,磁感应强度$B=0.5\mathrm{T}$,磁通量$\Phi=$________$\mathrm{Wb}$。

17、(10分)质量$m=5\mathrm{kg}$物体,从光滑斜面顶端静止释放,斜面倾角$\theta=37^\circ$,$\sin37^\circ=0.6$,$\cos37^\circ=0.8$,$g=10\mathrm{m/s^2}$。(1)求物体沿斜面下滑加速度;(2)若下滑位移$x=10\mathrm{m}$,求到达斜面底端速度大小。

18、(12分)平行板电容器极板间距$d=0.02\mathrm{m}$,两极板之间电压$U=100\mathrm{V}$。一个电子从负极板由静止开始加速,电子质量$m_e=9.1\times10^{-31}\mathrm{kg}$,元电荷$e=1.6\times10^{-19}\mathrm{C}$。(1)求极板间匀强电场电场强度大小;(2)求电子到达正极板时动能与速度大小。

19、(12分)金属棒$ab$放在光滑水平平行导轨上,导轨间距$L=0.4\mathrm{m}$,匀强磁场垂直导轨平面向下,磁感应强度$B=0.5\mathrm{T}$。金属棒以恒定速度$v=5\mathrm{m/s}$向右匀速运动,回路总电阻$R=2\Omega$。(1)求感应电动势大小;(2)求回路感应电流;(3)求维持匀速运动需要施加的外力大小。

20、(14分)竖直平面内光滑半圆轨道,半径$R=0.4\mathrm{m}$,小球质量$m=0.1\mathrm{kg}$,从轨道最低点以初速度$v_0$冲上半圆轨道。$g=10\mathrm{m/s^2}$。(1)小球恰好可以通过轨道最高点,求最高点速度;(2)此种情形下,小球在最低点的初速度$v_0$;(3)小球在最高点时,轨道对小球的弹力。

参考答案与解析

1、B解析:$a=\dfrac{v-v_0}{t}=\dfrac{8-4}{2}=2\mathrm{m/s^2}$。

2、A解析:机械能守恒,重力势能全部转化为动能,$E_\mathrm{k}=mgh$。

3、D解析:库仑定律$F=k\dfrac{q_1q_2}{r^2}$,距离加倍,力变为原来$\dfrac14$。

4、C解析:变压器电压比等于匝数比,$\dfrac{U_1}{U_2}=\dfrac{n_1}{n_2}$,$U_2=22\mathrm{V}$。

5、B解析:匀速圆周运动向心加速度公式$a=\dfrac{v^2}{R}$。

6、B解析:滑动摩擦力$f=\mu mg=8\mathrm{N}$,合力$F_\text{合}=F-f=2\mathrm{N}$,$a=\dfrac{F_\text{合}}{m}=1\mathrm{m/s^2}$。

7、B解析:布朗运动是悬浮颗粒运动,不是分子运动;温度是分子平均动能标志;气体压强由分子撞击产生;引力斥力同时存在。

8、A解析:光的频率由光源决定,折射时不变;介质中光速$v=\dfrac{c}{n}$,玻璃折射率大于空气,光速减小。

9、ACD解析:竖直上抛全程加速度恒为$g$,方向竖直向下,B错误。

10、ACD解析:磁感应强度$B$由磁场本身决定,和电流、导线无关,B错误。

11、ACD解析:振子最远位置速度为0,势能最大;平衡位置速度最大,回复力为0,B错误。

12、ABCD解析:全部选项符合热力学第一定律符号规则与理想气体特点。

13、2.01解析:$T=2\pi\sqrt{\dfrac{L}{g}}=2\pi\sqrt{\dfrac{1}{9.8}}\approx2.01\mathrm{s}$。

14、10解析:串联总电阻$R=R_1+R_2=10\Omega$。

15、0.8解析:动量守恒$m_0v_0=(m_0+M)v$,代入$0.2\times500=(0.2+M)\times100$,解得$M=0.8\mathrm{kg}$。

16、0.01解析:$\Phi=BS=0.5\times0.02=0.01\mathrm{Wb}$。

17、解:(1)沿斜面方向$mg\sin\theta=ma$,$a=g\sin37^\circ=6\mathrm{m/s^2}$(2)运动学公式$v^2=2ax$,$v=\sqrt{2ax}=\sqrt{2\times6\times10}=\sqrt{120}=2\sqrt{30}\mathrm{m/s}$

18、解:(1)$E=\dfrac{U}{d}=\dfrac{100}{0.02}=5000\mathrm{V/m}$(2)电场力做功等于动能增量:$E_\mathrm{k}=eU=1.6\times10^{-17}\mathrm{J}$$E_\mathrm{k}=\dfrac12 m_e v^2 \Rightarrow v=\sqrt{\dfrac{2eU}{m_e}}\approx5.93\times10^6\mathrm{m/s}$

19、解:(1)动生电动势$E=BLv=0.5\times0.4\times5=1\mathrm{V}$(2)$I=\dfrac{E}{R}=\dfrac{1}{2}=0.5\mathrm{A}$(3)安培力$F_\text{安}=BIL=0.5\times0.5\times0.4=0.1\mathrm{N}$,匀速外力与安培力等大反向,$F_\text{外}=0.1\mathrm{N}$

20、解:(1)恰好过最高点,重力提供向心力:$mg=m\dfrac{v_1^2}{R}$,$v_1=\sqrt{gR}=\sqrt{10\times0.4}=2\mathrm{m/s}$(2)机械能守恒:$\dfrac12mv_0^2=\dfrac12mv_1^2+mg\cdot2R$,解得$v_0=\sqrt{20}=2\sqrt{5}\mathrm{m/s}$(3)恰好通过最高点,轨道弹力等于0。

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  1. CONNECT:[ UseTime:0.000591s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000610s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000342s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000523s ]
  6. SELECT * FROM `set` [ RunTime:0.000262s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 529412 LIMIT 1 [ RunTime:0.000347s ]
  9. UPDATE `article` SET `lasttime` = 1793227128 WHERE `id` = 529412 [ RunTime:0.001113s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000301s ]
  11. SELECT * FROM `article` WHERE `id` < 529412 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000402s ]
  12. SELECT * FROM `article` WHERE `id` > 529412 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000338s ]
  13. SELECT * FROM `article` WHERE `id` < 529412 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000523s ]
  14. SELECT * FROM `article` WHERE `id` < 529412 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000664s ]
  15. SELECT * FROM `article` WHERE `id` < 529412 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000625s ]
0.082940s