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热点15 机械振动 机械波_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点15 机械振动 机械波_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点15 机械振动 机械波_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点15 机械振动 机械波_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点15 机械振动 机械波_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点 15 机械振动 机械波 1.(2022·江苏省模拟)如图所示,木块在水中沿竖直方向做简谐运动,运动过程中相对平衡 位置的位移x、运动的速度v随时间t变化的关系和木块受到的合力F、动能E 随相对平衡 k 位置的位移x变化的关系图像可能正确的是( ) 答案 B 解析 因为木块在水中沿竖直方向做简谐运动,故运动的速度 v和相对平衡位置的位移x 随时间t变化的关系图像都应该是正弦函数的波形,A错误,B正确;设木块底面积为S, 根据简谐运动的规律可知,浮力与重力平衡时木块所处位置为平衡位置,则有 F=-ρ 水 Sxg,则运动过程木块受到的合力F与x的图线应该过二、四象限,C错误;E -x图线斜 k 率表示合外力F,F随x变化,则E-x图线不是直线,D错误. k 2.(2022·浙江嘉兴市二模)如图所示,两块平行金属板M、N通过导线、开关与电源相接, 其中N板接地.板间用绝缘细线悬挂一带负电的小球.闭合开关S,把细线拉开一小角度 (小于10°)后,自A点静止释放小球,小球摆动经过最低点B.则( ) A.小球在A点的电势能大于在B点的电势能 B.只将M板向下移动时B点电势保持不变 C.只断开开关则小球将停止摆动 D.只把电源正负极对调则小球摆动周期变小 答案 D 解析 M板与电源正极相连,两板间电场方向由M板指向N板,故A点电势比B点电势高, 小球带负电,则小球在A点的电势能小于在B点的电势能,A错误;只将M板向下移动时, 则根据E=可知,电场强度变大,根据U =φ -φ =-Ed ,可知B点电势减小,B错误; BM B M BM 只断开开关,两板所带电荷量保持不变,电场强度保持不变,受力保持不变,仍然做单摆 运动,C错误;只把电源正负极对调,静电力由竖直向上变为竖直向下,等效重力场的等效重力加速度变大,由小球摆动的周期表达式为T=2π,知周期变小,D正确. 3.(2022·江苏省模拟)战绳训练被称为身体训练的“综合训练神器”,如图所示,训练者跨 步蹲,双手各正握同一材质的两绳一端,在竖直方向上下甩动,在绳子上交替做出不同的 波动,其运动状态可视为简谐运动.由于初练者双手肌肉力量不一致,左手每秒抖动 3下, 右手每秒抖动4下,则在左、右两绳上传播的波( ) A.周期之比为3∶4 B.速度之比为4∶3 C.波长之比为4∶3 D.振幅之比为3∶4 答案 C 解析 左手每秒抖动3下,右手每秒抖动4下,左、右手的频率之比为3∶4,则左、右绳 传播的波周期之比为4∶3,故A错误;因为两绳是同一材质,由波的传播速度由介质决定, 可知左、右绳的波速之比为 1∶1,故B错误;由λ=vT,可知左、右绳的波长之比为 4∶3,故C正确;由于未知左、右手甩动的幅度,无法判断两振幅之比,故D错误. 4.(2022·辽宁卷·3)一列简谐横波沿x轴正方向传播,某时刻的波形如图所示,关于质点P 的说法正确的是( ) A.该时刻速度沿y轴正方向 B.该时刻加速度沿y轴正方向 C.此后周期内通过的路程为A D.此后周期内沿x轴正方向迁移为λ 答案 A 解析 波沿x轴正方向传播,由“同侧法”可知,该时刻质点P的速度沿y轴正方向,加 速度沿y轴负方向,选项A正确,B错误;在该时刻质点P不在特殊位置,则在周期内的 路程不一定等于A,选项C错误;质点只能在平衡位置附近振动,而不随波迁移,选项D 错误. 5.(多选)(2022·广东省模拟)一简谐横波沿x轴正方向传播,在t=时刻,该波的波形图如图 甲所示,P、Q是介质中的两个质点.图乙表示介质中某质点的振动图像.下列说法正确的 是( )A.质点Q的振动图像与图乙相同 B.在t=0时刻,质点P的速率比质点Q的大 C.在t=0时刻,质点P的加速度的大小比质点Q的大 D.在t=0时刻,质点P与其平衡位置的距离比质点Q的大 答案 CD 解析 由题图乙可知,在t=时刻,质点正在向y轴负方向振动,而从题图甲可知,质点Q 在t=时刻正在向y轴正方向运动,A错误;由t=时刻的波形图可知,t=0时刻,质点P 正位于波谷,速率为零,质点 Q正在平衡位置,故在t=0时刻,质点P的速率小于质点 Q,B错误;t=0时刻,质点P正位于波谷,具有沿y轴正方向的最大加速度,质点Q在平 衡位置,加速度为零,C正确;t=0时刻,质点P正位于波谷,偏离平衡位置的距离最大, 质点Q在平衡位置,偏离平衡位置的距离为零,D正确. 6.(多选)(2022·广东省模拟)甲、乙两列简谐横波在同种均匀介质中传播,如图所示为 t=0 时刻两列波恰好在坐标原点相遇时的波形图,甲波的频率为2 Hz,沿x轴正方向传播,乙 波沿x轴负方向传播,则下列说法正确的是( ) A.甲、乙两波的频率之比为1∶1 B.两列波叠加后,x=0处的质点振幅为20 cm C.t=0.75 s时,x=0处的质点处于平衡位置,且向下运动 D.两列波叠加后,x=2 m处为振动加强点 答案 ACD 解析 甲、乙两列简谐横波在同种均匀介质中传播波速相等,由λ =λ =2 m,可知频率 甲 乙 之比为1∶1,A正确;由“上下坡”法可知,两列波叠加后,x=0处的质点振动加强,振 幅为A =A +A =10 cm+20 cm=30 cm ,B错误;两波的周期为T== s=0.5 s.由 0 甲 乙 “上下坡”法可知,t=0时刻,x=0处的质点处于平衡位置,且向上运动,因为t=0.75 s = ,所以t=0.75 s时,x=0处的质点处于平衡位置,且向下运动,C正确;两列波叠加 后,在x=2 m处两波的波峰与波峰或波谷与波谷相遇,振动加强,D正确. 7.(多选)(2022·山东日照市一模)一列沿x轴传播的简谐横波,t=3 s时的波形如图甲所示, 平衡位置为x=3 m处质点的振动图像如图乙所示,则波速可能是( )A.1 m/s B. m/s C. m/s D. m/s 答案 AB 解析 在t=3 s时,由平衡位置为x=3 m处质点的振动图像可知,波的周期为T=6 s,质 点在t=3 s时从平衡位置向下振动,若波沿x轴正方向传播,则x=3 m处质点可能处在(n +)λ处,则有(n+)λ=3 m(n=0,1,2,3,…),解得λ= m(n=0,1,2,3,…),则波速可能是v= = m/s= m/s(n=0,1,2,3,…),当n=0时v=1 m/s,当n=1时v= m/s,当n=2时v= m/s;若波沿x轴负方向传播,则x=3 m处质点可能处在nλ处,则有nλ= 3 m(n=1,2,3,…),解得 λ= m(n=1,2,3,…),则波速可能是 v== m/s= m/s(n= 1,2,3,…),当n=1时v= m/s,当n=2时v= m/s,因此由题意可知,A、B正确,C、D 错误.
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  1. CONNECT:[ UseTime:0.000472s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000588s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000301s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000307s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000448s ]
  6. SELECT * FROM `set` [ RunTime:0.000213s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000563s ]
  8. SELECT * FROM `wendang` WHERE `id` = 372498 LIMIT 1 [ RunTime:0.000477s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 372498 [ RunTime:0.007709s ]
  10. UPDATE `wendang` SET `lasttime` = 1773108867 WHERE `id` = 372498 [ RunTime:0.000581s ]
  11. SELECT * FROM `wendang` WHERE `id` < 372498 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000556s ]
  12. SELECT * FROM `wendang` WHERE `id` > 372498 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001384s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 372498 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005724s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 372498 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001045s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 372498 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005948s ]
0.096365s