某同学在做“探究小车速度随时间变化的规律”的实验请你帮助解决下列问题.(1)在做用打点计时器测速度
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\uff081\uff09\u6253\u70b9\u8ba1\u65f6\u5668\u662f\u4e00\u79cd\u8ba1\u65f6\u4eea\u5668\uff0c\u5176\u7535\u6e90\u9891\u7387\u4e3a50Hz\uff0c\u5e38\u7528\u7684\u7535\u78c1\u6253\u70b9\u8ba1\u65f6\u5668\u548c\u7535\u706b\u82b1\u8ba1\u65f6\u5668\u4f7f\u7528\u7684\u662f\u4ea4\u6d41\u7535\uff0c\u5b83\u4eec\u662f\u6bcf\u96940.02s\u6253\u4e00\u4e2a\u70b9\uff0e\uff082\uff09\u5f00\u59cb\u8bb0\u5f55\u65f6\uff0c\u5e94\u5148\u7ed9\u6253\u70b9\u8ba1\u65f6\u5668\u901a\u7535\u6253\u70b9\uff0c\u7136\u540e\u91ca\u653e\u7eb8\u5e26\u8ba9\u7eb8\u5e26\uff08\u968f\u7269\u4f53\uff09\u5f00\u59cb\u8fd0\u52a8\uff0c\u5982\u679c\u5148\u653e\u5f00\u7eb8\u5e26\u5f00\u59cb\u8fd0\u52a8\uff0c\u518d\u63a5\u901a\u6253\u70b9\u8ba1\u65f6\u65f6\u5668\u7684\u7535\u6e90\uff0c\u7531\u4e8e\u91cd\u7269\u8fd0\u52a8\u8f83\u5feb\uff0c\u4e0d\u5229\u4e8e\u6570\u636e\u7684\u91c7\u96c6\u548c\u5904\u7406\uff0c\u4f1a\u5bf9\u5b9e\u9a8c\u4ea7\u751f\u8f83\u5927\u7684\u8bef\u5dee\uff1b\u540c\u65f6\u5148\u6253\u70b9\u518d\u91ca\u653e\u7eb8\u5e26\uff0c\u53ef\u4ee5\u4f7f\u6253\u70b9\u7a33\u5b9a\uff0c\u63d0\u9ad8\u7eb8\u5e26\u5229\u7528\u7387\uff0c\u53ef\u4ee5\u4f7f\u7eb8\u5e26\u4e0a\u6253\u6ee1\u70b9\uff0c\u6545BCD\u9519\u8bef\uff0cA\u6b63\u786e\uff0e\u6545\u9009\uff1aA\uff083\uff09\u6bcf\u76f8\u90bb\u4e24\u70b9\u95f4\u8fd8\u67094\u4e2a\u8ba1\u65f6\u70b9\uff0c\u6240\u4ee5\u76f8\u90bb\u7684\u8ba1\u6570\u70b9\u95f4\u7684\u65f6\u95f4\u95f4\u9694T=0.1s\uff0c\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\u53ef\u4ee5\u6c42\u51fa\u6253\u7eb8\u5e26\u4e0aB\u70b9\u65f6\u5c0f\u8f66\u7684\u77ac\u65f6\u901f\u5ea6\u5927\u5c0f\uff0evB=0.014+0.0192\u00d70.1=0.165 m/s\u8bbeA\u5230B\u4e4b\u95f4\u7684\u8ddd\u79bb\u4e3ax1\uff0c\u4ee5\u540e\u5404\u6bb5\u5206\u522b\u4e3ax2\u3001x3\u3001x4\u3001x5\u3001x6\uff0c\u6839\u636e\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\u7684\u63a8\u8bba\u516c\u5f0f\u25b3x=aT2\u53ef\u4ee5\u6c42\u51fa\u52a0\u901f\u5ea6\u7684\u5927\u5c0f\uff0c\u5f97\uff1ax4-x1=3a1T2 x5-x2=3a2T2 x6-x3=3a3T2 \u4e3a\u4e86\u66f4\u52a0\u51c6\u786e\u7684\u6c42\u89e3\u52a0\u901f\u5ea6\uff0c\u6211\u4eec\u5bf9\u4e09\u4e2a\u52a0\u901f\u5ea6\u53d6\u5e73\u5747\u503c\uff0c\u5f97\uff1aa=13\uff08a1+a2+a3\uff09=0.0387+0.0339+0.0288?0.0238?0.019?0.0149\u00d7(0.01)2=0.496m/s2\u6545\u7b54\u6848\u4e3a\uff1a\uff081\uff09\u4ea4\u6d41\u7535\uff0c0.02\uff1b\uff082\uff09A\uff1b\uff083\uff09\u24600.165\uff0c\u24610.496
(1)在做用打点计时器测速度的实验中,要用到打点计时器,打点计时器是一种计时仪器,在图1所示打点计时器的结构图中,编号②的名称是线圈; 编号④的名称是永久磁铁,编号⑤的名称是振针.现在实验室多用电火花计时器,其电源电压是交流220V,我国常用的电源频率为50Hz,它每隔0.02s打一个点.(2)在实验的过程中,有如下基本步骤,它们正确的排列顺序为
A.把打点计时器固定在桌子上
B.安好纸带
D.接通低压交流电源
C.松开纸带让物体带着纸带运动
F.断开开关
E.取下纸带
(3)从纸带上的数据我们可以发现:从计数点A到E相邻的计数点距离越来越小,所以计数点A到E的速度在减小.
而小车做的是加速运动,所以小车与纸带的右端相连.
利用匀变速直线运动的推论得:
vD=
xCE |
tCE |
. 绛旓細锛1锛夎瀹為獙鍘熺悊鏄氳繃鐮旂┒绾稿甫涓婄殑鐐癸紝鏉ョ爺绌閫熷害涓鏃堕棿鐨勫叧绯伙紝鎵浠ラ渶瑕佺數纾佹墦鐐硅鏃跺櫒銆佷綆鍘嬩氦娴佺數婧愭潵鎵撶偣鍗虫眰鏃堕棿锛岀粏缁冲拰绾稿甫銆佸惈鏈夋粦杞殑闀挎湪鏉挎潵瀹為獙瑁呭锛岀敤鍒诲害灏烘祴閲忚窛绂伙紱鎵浠ヤ笉闇瑕佹祴閲忚川閲忋佺洿娴佺數婧愬拰绉掕〃锛屽嵆涓嶉渶瑕佺殑浠櫒涓猴細澶╁钩銆佷綆鍘嬬洿娴佺數婧愬拰绉掕〃锛屾晠閫塀DG锛庯紙2锛夊湪鍧愭爣绾镐笂浣滃嚭5涓... 绛旓細锛1锛夊湪鍋氱敤鎵撶偣璁℃椂鍣ㄦ祴閫熷害鐨勫疄楠屼腑锛岃鐢ㄥ埌鎵撶偣璁℃椂鍣紝鎵撶偣璁℃椂鍣ㄦ槸涓绉嶈鏃朵华鍣紝鍦ㄥ浘1鎵绀烘墦鐐硅鏃跺櫒鐨勭粨鏋勫浘涓紝缂栧彿鈶$殑鍚嶇О鏄嚎鍦堬紱 缂栧彿鈶g殑鍚嶇О鏄案涔呯閾侊紝缂栧彿鈶ょ殑鍚嶇О鏄尟閽堬紟鐜板湪瀹為獙瀹ゅ鐢ㄧ數鐏姳璁℃椂鍣紝鍏剁數婧愮數鍘嬫槸浜ゆ祦220V锛屾垜鍥藉父鐢ㄧ殑鐢垫簮棰戠巼涓50Hz锛屽畠姣忛殧0.02s鎵撲竴涓偣锛... 绛旓細1.50)脳10?20.08=0.495m/s锛庯紙3锛夊鍥炬墍绀猴紟锛4锛夊浘璞′笌绾靛潗鏍囩殑浜ょ偣鍧愭爣灏辨槸0鏃跺埢鐨閫熷害锛屽嵆鎵撲笅A鐐规椂灏忚溅鐨勯熷害锛屾墍浠A=0.330m/s锛庡浘璞$殑鏂滅巼绛変簬灏忚溅鐨勫姞閫熷害a锛濃柍v鈻硉锛0.650?0.3300.16m/s2锛2.00m/s2锛庢晠绛旀涓猴細锛1锛塀锛岋紙2锛0.495锛岋紙3锛夊鍥炬墍绀猴紝锛4锛0.... 绛旓細鏍规嵁绾稿甫鐨勬暟鎹緱鍑虹浉閭荤殑璁℃暟鐐归棿鐨勮窛绂诲澶э紝鍒灏忚溅鐨閫熷害鍦ㄥ澶э紟鏍规嵁鍖鍙橀熺洿绾胯繍鍔ㄤ腑鏃堕棿涓偣鐨勯熷害绛変簬璇ヨ繃绋嬩腑鐨勫钩鍧囬熷害锛屽彲浠ユ眰鍑烘墦绾稿甫涓夿鐐规椂灏忚溅鐨勭灛鏃堕熷害澶у皬锛巚B=0.03612脳0.1=0.18m/s鏍规嵁鍖鍙橀熺洿绾胯繍鍔ㄧ殑鎺ㄨ鍏紡鈻硏=aT2鍙互姹傚嚭鍔犻熷害鐨勫ぇ灏忥紝寰楋細a=0.0361?0.012?0.012(0.1)... 绛旓細鍖鍔犻熺洿绾胯繍鍔 0.8 3.2 璇曢鍒嗘瀽锛氱浉閭讳袱鐐归棿鐨鏃堕棿闂撮殧鐩稿悓锛屽潎涓0.1s锛屾墍浠ュ湪鐩稿悓鐨勬椂闂村唴閫氳繃鐨勪綅绉婚愭笎澧炲ぇ锛灏忚溅鍋鐨勬槸鍔犻熻繍鍔紝鍙堢敱浜庝綅绉诲樊鍊兼亽瀹氫笉鍙橈紝鐢 鍙煡灏忚溅鍋氱殑鏄寑鍔犻熺洿绾胯繍鍔紝AB=1.20cm锛孊C=2cm锛孋D=2.8cm锛孌E=3.60cm锛孍F=4.4cm锛岀敱閫愬樊娉曞彲鐭ュ姞閫熷害 锛孌... 绛旓細锛1锛塿 B 锛1.38 m/s v D 锛3.90m/s锛2锛夎涓嬪浘 a锛12.6 m/s 2 璇曢鍒嗘瀽锛氾紙1锛夋湁鍋氬寑鍙橀熺洿绾胯繍鍔ㄧ殑鐗╀綋涓棿鏃跺埢閫熷害绛変簬杩囩▼涓殑骞冲潎閫熷害 浣滃浘锛2锛夋牴鎹弿鐐规硶鍙緱涓嬪浘锛屽浘鍍忕殑鏂滅巼琛ㄧず鐗╀綋杩愬姩鐨勫姞閫熷害锛屼粠鍥句腑鎵惧嚭涓ょ偣寰梐锛12.6 m/s 2 鐐硅瘎锛氬湪澶勭悊绾稿甫闂鏃朵竴... 绛旓細1銆佷粠绾稿甫涓婄殑鏁版嵁鎴戜滑鍙互鍙戠幇锛氫粠璁℃暟鐐笰鍒癊鐩搁偦鐨勮鏁扮偣璺濈瓒婃潵瓒婂ぇ锛屾墍浠ヨ鏁扮偣A鍒癊鐨閫熷害鍦ㄥ澶э紟鑰灏忚溅鍋鐨勬槸鍔犻熻繍鍔紝鎵浠ュ皬杞︿笌绾稿甫鐨勫彸绔浉杩烇紟鐢变簬姣忕浉閭讳袱涓鏁扮偣闂磋繕鏈4涓偣娌℃湁鐢诲嚭锛屾墍浠ョ浉閭荤殑璁℃暟鐐归棿鐨鏃堕棿闂撮殧T=0.1s锛屽埄鐢ㄥ寑鍙橀熺洿绾胯繍鍔ㄧ殑鎺ㄨ寰楋細vD=0.5064?0.22122脳0.1... 绛旓細A銆閫熷害-鏃堕棿鍥捐薄鎻忚堪鐨勮繍鍔ㄤ负鍖鍔犻熺洿绾胯繍鍔紝涓庣焊甯︾殑鎯呭喌鐩哥锛屾晠A姝g‘锛嶣D銆佺敱绾稿甫涓婄殑璁℃暟鐐瑰彲浠ョ湅鍑猴紝鍦ㄧ浉绛夌殑鏃堕棿闂撮殧鍐咃紝灏忚溅鐨勪綅绉昏秺鏉ヨ秺澶э紝鍗冲皬杞︾殑閫熷害瓒婃潵瓒婂ぇ锛涗絾鏄疊D涓浘璞℃墍鎻忚堪鐨勭墿浣撶殑閫熷害瓒婃潵瓒婂皬锛屾晠BD閿欒锛嶤銆佸浘璞′腑鎻忚堪鐨勭墿浣撳仛鍖閫熺洿绾胯繍鍔紝涓庣焊甯﹁褰曟儏鍐典笉绗︼紝鏁匔閿欒锛庢晠... 绛旓細x5=AF-AE=4.40cm锛岀敱姝ゅ彲鐭ュ皬杞﹀湪杩炵画鐩哥瓑鏃堕棿鍐呯殑浣嶇Щ宸负甯告暟锛屽嵆鈻硏=0.80cm锛屾晠灏忚溅鍋鍖鍔犻熺洿绾胯繍鍔紝鏍规嵁鈻硏=aT2锛屽皢T=0.1s甯﹀叆鍙В寰梐=0.80m/s2锛涙牴鎹湪鍖鍙橀熺洿绾胯繍鍔ㄤ腑涓棿鏃跺埢鐨勭灛鏃閫熷害绛変簬璇ヨ繃绋嬩腑鐨勫钩鍧囬熷害鏈夛細vD=XCEtCE=0.32m/s鏁呯瓟妗堜负锛氬寑鍔犻熺洿绾匡紝0.80锛0.32锛 绛旓細鎵浠ヤ笉闇瑕佺琛紝璇ュ疄楠屼笉闇瑕佹祴閲忓皬鏈ㄥ潡鍜灏忚溅鐨勮川閲忥紝涓嶉渶瑕佸ぉ骞筹紝鍦ㄥ鐞嗙焊甯︽椂锛岄渶瑕佸埢搴﹀昂娴嬮噺鐐硅抗闂寸殑璺濈锛庢晠閫夛細A锛庯紙2锛変氦娴佺數鐨勯鐜囦负50Hz锛岀煡姣忛殧0.02s鎵撲竴涓偣锛屾瘡涓や釜鐩搁偦璁℃暟鐐归棿鏈夊洓涓偣娌℃湁鐢诲嚭鐭ョ浉閭昏鏁扮偣闂寸殑鏃堕棿闂撮殧涓0.1s锛庣5涓鏁扮偣鐨勭灛鏃閫熷害v5=(26.55? 本站交流只代表网友个人观点,与本站立场无关 |