黑龙江工程学院
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- 波由一种介质进入另外一种介质时,其传播速度、频率、波长( )
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- 一个质点在做圆周运动时,则有( )
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A:对 B:错
答案:错
A:错 B:对
答案:错
A:错 B:对
答案:对
A:对 B:错
答案:错
A:对 B:错
答案:错
A:错 B:对
答案:对
A:对 B:错
答案:错
A:错 B:对
答案:对
A:对 B:错
答案:错
A:对 B:错
A:错 B:对
A:错 B:对
A:对 B:错
A:对 B:错
A:错 B:对
A:对 B:错
A:对 B:错
A:错 B:对
A:对 B:错
A:对 B:错
A: B: C: D:
A:上面的线先断 B:下面的线先断 C:两根线都不断 D:两根线一起断
A:运动一个周期,位置一定不变,路程一定等于振幅的4倍 B:运动一段时间位置不变时,路程一定等于振幅的4倍 C:运动半个周期,位置一定不变,路程一定等于振幅的2倍 D:运动3/4个周期,位置可能不变,路程等于振幅的3倍
A:等压过程最大,等温过程最小 B:绝热过程最大,等温过程最小 C:等压过程最大,绝热过程最小 D:绝热过程最大,等压过程最小
A: B: C: D:
A:系统吸热 B:对外做功 C:系统放热 D:内能不变
A:6J B:5J C:3J D:10J
A:把两个缝的缝宽稍微调窄 B:使两缝的间距变小 C:使屏靠近双缝 D:改用波长较小的单色光源
A:物体所受合外力的方向一定与物体的加速度的方向相同 B:质量较大的物体的加速度一定小 C:受到外力较小的物体加速度一定小 D:物体所受合外力的方向一定与物体的运动方向相同
A:图(a)总净功为正,图(b)总净功为正 B:图(a)总净功为正,图(b)总净功为负 C:图(a)总净功为负,图(b)总净功为正 D:图(a)总净功为负,图(b)总净功为负
A:温度、压强都相同 B:温度相同,但氦气压强小于氮气压强 C:温度、压强均不相同 D:温度相同,但氦气压强大于氮气压强
A:热量可以从高温物体传到低温物体,但不能从低温物体传到高温物体 B:不可逆过程就是不能向相反方向进行的过程 C:自然界中的一切自发过程都是不可逆的 D:任何过程总是沿着熵增加的方向进行
A:氧气的温度比氢气的高 B:氢气的温度比氧气的高 C:两种气体的压强相同 D:两种气体的温度相同
A:1:2:2 B:1:2:1 C:2:1:2 D:1:1:1
A:都发生变化 B:都不发生变化 C:速度和频率变,波长不变 D:速度和波长变,频率不变
A:净功增大,热机效率不变 B:净功增大,热机效率降低 C:净功增大,热机效率提高 D:净功和热机效率都不变
A:波沿x轴正方向传播 B:B点处质点向y轴正向运动 C:C点和B点的振动方向相反 D:C点处质点向y轴负向运动
A: B: C: D:
A: B: C: D:
A:2R B: C:0 D:
A:线圈中感应电流为逆时针方向 B:线圈中无感应电流 C:线圈中感应电流方向无法确定 D:线圈中感应电流为顺时针方向
A: B: C: D:
A: B: C: D:
A:不为零,但保持不变 B:恒为零 C:随F成正比地增大 D:开始时随F增大,达到某一最大值后,就保持不变
A:9/8倍 B:3/4倍 C:1/2倍 D:2/3倍
A:0 B: C: D:
A: B: C: D:
A:m和M间无摩擦,而M与地间有摩擦 B:两处都有摩擦 C:两处都无摩擦 D:m和M间有摩擦,而M与地间无摩擦
A: B: C: D:
A:波沿轴正方向传播 B:波速为10m/s C:周期为1/3s D:波长为5m
A:子弹减少的动能转变为木块的动能 B:子弹-木块系统地的机械能守恒 C:子弹动能的减少等于子弹克服木块阻力所作的功 D:子弹克服木块阻力所作的功等于这一过程中产生的热
A:切向加速度一定改变,法向加速度也改变 B:切向加速度可能不变,法向加速度一定改变 C:切向加速度一定改变,法向加速度不变 D:切向加速度可能不变,法向加速度不变
A: B: C: D:
A:1/2 s B:1/4 s C:1/8 s D:1/3 s
A: B: C: D:
A: B: C: D:
A:9m/s B:7.8m/s C:7.2m/s D:8m/s
A:振子加速度逐渐增大 B:振子位移逐渐增大 C:振子速度逐渐增大 D:振子所受回复力逐渐增大
A: B: C: D:
A: B: C: D:
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