一道高中物理必修一计算题题

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给大家带来的不便深表歉意~(*^__^*)~Sina Visitor System笑喷!这道高中物理题刷屏了,简直是一道送命题啊!
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  年底到了,  各种考试也紧跟着来了。  最近,  江西丰城的一张物理试卷  成功引起大家的注意。  没忍住,狂笑中!  11月30日,  江西丰城中学物理重点班同学迎来考试。  其中试卷里一道奇葩题让同学们难以理解。  你认为下面哪一个最帅?  A、马云  B、库里  C、鹿晗  D、可爱的物理老师  你选谁?    这题一出,简直操碎了网友的心:    这是小编我见过的最有趣的物理题,  也是一道送命题。  你有没有标准答案?  在线等!    奇葩试题都是年年有,  今天我们就来说说  这些年见过的奇葩试题。  ▼  1、老师,你先给论证一下?!  2、任课老师是谁?注意门槛题,答错扣41分,直接不及格。  3、同样是门槛题,答错扣41分,不过老师,您这么自恋,校长知道吗?  4、3个番茄+4个鸡蛋=1盘子菜。  5、75-34=41,别问怎么得来的,我想静静!  6、哇!18分的题,这是最好拿分的题呢还是最不好拿分的题?  你还见过哪些奇葩试题吗?  快来留言说一说!
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物理问题希望您提供一道有关示波器的高中物理题_百度知道(Physical problems I hope to provide you a high school physics problem _ Baidu know about oscilloscope).doc 21页
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物理问题希望您提供一道有关示波器的高中物理题_百度知道(Physical problems I hope to provide you a high school physics problem _ Baidu know about oscilloscope)
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物理问题希望您提供一道有关示波器的高中物理题_百度知道(Physical problems I hope to provide you a high school physics problem _ Baidu know about oscilloscope)
The vertical and horizontal shifts of the left and right ends of the first line below the screen are used to adjust the position of the image in both vertical and horizontal directions. The two knobs in them are "Y gain" and "X gain", which are used to adjust the magnitude of the image in vertical and horizontal directions, and the amplitude increases continuously when clockwise.
The big knob on the left of the middle line is "attenuated". It has 1, 10, 100, 1000, four blocks. The left "1" block does not decay, and the rest of the blocks reduce the input voltage to the original
The right side of the sine symbol is not attenuated, but by the vertical direction of the oscilloscope to provide AC test signal voltage, can be used to observe the sine wave or check the oscilloscope is working properly.
The middle line on the right side of the knob is "large scanning range", also has four gears, can change the frequency range and scanning voltage in the horizontal direction, the first stop is 10 ~ 100Hz, turn each block, scan frequency increased 10 times, the right is the "X" block, the use of this block, without scanning voltage machine, voltage level direction can be input from the outside.
The small knob in the middle is "scanning fine tuning", which is used to adjust the scanning frequency in horizontal direction, and the frequency increases continuously when clockwise.
The bottom line, the middle knob, the Y input, the X input, and the ground are vertical, horizontal, and common ground input terminals. The "DC" and "AC" on the left are the DC and AC select switches for the vertical input signal. In the "DC" position signal, the applied volta in the "AC" position, the signal voltage is input through a capacitor, it can make the AC signal through the DC component and partition. The "sync" on the right is also a selector s
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可以看出截面一定,拉力和伸长量成正比,(比较1,2数据)长度一定,拉力和截面呈反比,1,3 数据所以,伸长量=K*长度/截面*拉力K是比例系数,带入数据得到K=0.04/5000所以对于4m长,0.8cm^2截面积,拉升要0.001就是0.4cm带入公式:0.4=0.04/.8*拉力0.4=0.04/5000*5*拉力,解得拉力是10000N
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