如图是某同学利用电磁打点计时器研究7滑块运动四实验中获得四一条纸带，纸带r端与滑块相连接，打点计时器

\u7528\u7535\u78c1\u6253\u70b9\u8ba1\u65f6\u5668\u505a\u201c\u63a2\u7a76\u5c0f\u8f66\u901f\u5ea6\u968f\u65f6\u95f4\u53d8\u5316\u89c4\u5f8b\u201d\u5b9e\u9a8c\uff0c\u5982\u56fe\u662f\u91c7\u7528\u6b63\u786e\u7684\u5b9e\u9a8c\u624b\u6bb5\uff0c\u7528\u6253\u70b9\u8ba1\u65f6\u5668\u5728\u7eb8\u5e26

\uff081\uff09\u7535\u78c1\u6253\u70b9\u8ba1\u65f6\u5668\u4f7f\u7528\u7684\u662f\u7535\u538b\u4ea4\u6d41\u7535\u6e90\uff0c\u6b63\u5e38\u5de5\u4f5c\u65f6\u6bcf\u96940.02s\u6253\u4e00\u4e2a\u70b9\uff0e\uff082\uff09\u7eb8\u5e26\u4e0a\u9762\u6bcf\u6253\u4e00\u70b9\u7684\u65f6\u95f4\u95f4\u9694\u662f0.02s\uff0c\u6bcf\u4e94\u4e2a\u8ba1\u65f6\u70b9\u53d6\u4e00\u4e2a\u6d4b\u91cf\u70b9\uff0c\u56e0\u6b64\u8ba1\u6570\u70b9\u4e4b\u95f4\u7684\u65f6\u95f4\u95f4\u9694\u4e3a\uff1aT=0.1s\uff0e\u6839\u636e\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\u4e2d\u65f6\u95f4\u4e2d\u70b9\u7684\u901f\u5ea6\u7b49\u4e8e\u8be5\u8fc7\u7a0b\u4e2d\u7684\u5e73\u5747\u901f\u5ea6\uff0c\u56e0\u6b64\u6709\uff1a v C = x BD 2T = 0.048 0.2 =0.24m/s \u6839\u636e\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\u7684\u63a8\u8bba\u25b3x=aT 2 \uff0c\u6709\uff1a a= s 4 + s 3 -s 2 -s 1 4T 2 = 0.0641-0.0319 0.04 =0.805m/s 2 \uff0e\u6545\u7b54\u6848\u4e3a\uff1a\uff081\uff09\u4f4e\u538b\u4ea4\u6d41\u30010.1s\uff1b\uff082\uff090.805\uff0c0.24\uff0e

\uff081\uff09\u7535\u78c1\u6253\u70b9\u8ba1\u65f6\u5668\u63a54\uff5e6V\u7684\u4ea4\u6d41\u7535\uff0c\u9891\u7387\u4e3a50Hz\uff0c\u6bcf\u96940.02s\u6253\u4e00\u6b21\u70b9\uff1b\uff082\uff09\u5148\u5b89\u88c5\u5668\u6750\uff08ADB\uff09\uff0c\u518d\u5b9e\u9a8c\u64cd\u4f5c\uff08CFE\uff09\uff0c\u6570\u636e\u5904\u7406\uff0c\u6700\u540e\u6574\u7406\u5668\u6750\uff1b\uff083\uff09\u4ed6\u5728\u505a\u5b9e\u9a8c\u65f6\uff0c\u7528\u6253\u70b9\u8ba1\u65f6\u5668\u6d4b\u91cf\u65f6\u95f4\uff0c\u4e0d\u9700\u8981\u79d2\u8868\uff1b\u81ea\u7531\u843d\u4f53\u52a0\u901f\u5ea6\u4e0e\u8d28\u91cf\u65e0\u5173\uff0c\u6545\u4e0d\u9700\u8981\u5929\u5e73\uff1b\u8981\u6d4b\u91cf\u7eb8\u5e26\uff0c\u6545\u9700\u8981\u523b\u5ea6\u5c3a\uff1b\u4e0d\u9700\u8981\u6d4b\u91cf\u91cd\u529b\uff0c\u6545\u4e0d\u9700\u8981\u5f39\u7c27\u79e4\uff1b\uff084\uff09\u6839\u636e\u25b3x=aT2\uff0c\u6709\uff1ag=[(20+17+13)?(9.5+5.7+1.9)]\u00d70.001(3\u00d70.02)2=9.5m/s2\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\u4e2d\uff0c\u5e73\u5747\u901f\u5ea6\u7b49\u4e8e\u4e2d\u95f4\u65f6\u523b\u7684\u77ac\u65f6\u901f\u5ea6\uff0c\u6545D\u70b9\u7684\u901f\u5ea6\u4e3a\uff1avD=(9.5+13)\u00d70.0012\u00d70.02=0.57m/s\uff085\uff09\u7531\u4e8e\u5b58\u5728\u7eb8\u5e26\u4e0e\u6253\u70b9\u8ba1\u65f6\u5668\u95f4\u7684\u6469\u64e6\u529b\u548c\u91cd\u9524\u4e0b\u843d\u65f6\u53d7\u5230\u7684\u7a7a\u6c14\u963b\u529b\uff0c\u6545\u5b9e\u9a8c\u6d4b\u5f97\u7684\u52a0\u901f\u5ea6\u6bd4\u91cd\u529b\u52a0\u901f\u5ea6\u7565\u5c0f\uff1b\u6545\u7b54\u6848\u4e3a\uff1a\uff081\uff096\uff0c0.02\uff1b\uff082\uff09ADBCFE\uff1b\uff083\uff09C\uff1b\uff084\uff090.57\uff0c9.5\uff1b\uff085\uff09\u5c0f\uff0c\u5b58\u5728\u7eb8\u5e26\u4e0e\u6253\u70b9\u8ba1\u65f6\u5668\u95f4\u7684\u6469\u64e6\u529b\u548c\u91cd\u9524\u4e0b\u843d\u65f6\u53d7\u5230\u7684\u7a7a\u6c14\u963b\u529b\uff0e

①实验室常用的电磁式打点计时器用的是低压交流电源；
电磁式打点计时器用电源频率为个0HZ．即每隔0.0左s打一个点，所以Am时间间隔0.08s
②图中连续四段位移逐渐增大，所以该滑块的运动属于加速直线运动．
Am段的平均速度

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