高一物理:第16题怎么做
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\u4ee5\u5c0f\u7403\u4f5c\u4e3a\u5206\u6790\u5bf9\u8c61\uff1a
\u4f9d\u9898\u610f\u5f97\uff0c\u6c34\u5e73\u65b9\u5411\uff1aTsin45\u00b0-Ncos45\u00b0=ma
\u7ad6\u76f4\u65b9\u5411 \uff1aG=Tcos45\u00b0+Ncos45\u00b0
\u4f9d\u9898\u610f\u5f97\uff1aa=2g ,G=mg
\u5f97N<0 .\u6240\u4ee5\u5c0f\u7403\u4e0d\u53ef\u80fd\u4e0e\u659c\u9762\u63a5\u89e6
\u6240\u4ee5\u5c0f\u7403\u4e0e\u504f\u79bb\u659c\u9762\uff0c\u53d7\u529b\u56fe\uff1a
F \u4e3aT\u4e0eG\u7684\u5408\u529b
\u4f9d\u9898\u610f\uff1aF=ma
a=2g ,G=mg
\u51e0\u4f55\u5173\u7cfb\uff1aT²-G²=F²
\u89e3\u5f97T=\u221a5mg
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根据动量守恒，FΔt=mv=ρSv^2Δt，解得v=15m/s功率P=Fv=8100N*15m/s=121500W
绛旓細閲囩撼鎴戝惂
绛旓細G*tan 胃
绛旓細瑙ｆ硶1锛氶氳В锛堝熀鏈叕寮忔硶锛夋牴鎹畍0=0鏃讹紝x=璁＄畻 璁捐溅鍘㈠叡鏈塶鑺傦紝姣忚妭闀夸负x锛屽綋绗竴鑺傝溅鍘㈠畬鍏ㄩ氳繃瑙傚療鑰呮椂锛屽垪杞︿綅绉讳负x锛岀粡鍘嗘椂闂翠负5s銆傜敱x=寰梮=脳52 鈶 褰撳垪杞﹀叏閮ㄩ氳繃瑙傚療鑰呮椂锛屽垪杞︿綅绉讳负nx鍘嗘椂20s锛屾墍浠ュ張鏈塶x=脳202 鈶 鐢扁憼鈶″彲寰梟=锛堬級2=16 瑙ｆ硶2锛氭牴鎹垵閫熶负闆剁殑鐗╀綋缁忓巻杩炵画...
绛旓細(1)螖H1=75-10=65cm 螖H2=130-75=55cm 螖H1- 螖H2=gt^2 t=0.1s v2=(螖H1+ 螖H2)/2t=6m/s h=v^2/2g=1.8m 鎬婚珮H H=h+0.1+0.55=2.45m
绛旓細鍥炵瓟锛氬畾婊戣疆鍙敼鍙樺姏鐨勬柟鍚戜笉鏀瑰彉鍔涚殑澶у皬,鎵鏈夌涓绌哄～5
绛旓細a=(x2-x1)/T^2 T=0.08 a=6.25m/s^2 VB=(x2+x1)/2T=2.125m/s=2.13m/s
绛旓細15 Vab=锛圴a+Vb锛/2 Vb=5m/s Vbc=锛圴c+Vb锛/2 Vc=7m/s a=(Vb^2-Va^2)/2s=(25-1)/8=3m/s^2 Sac=(Vc^2-Vb^2)/2a=4m 16. 4s鏈熷害V=v0+at=20-16=4m/s 浠庡埞杞﹀埌闈欐4s鏈 V骞冲潎=锛20+4)/2=12m/s s=vt=12*4=48m 姹借溅浠庡埞杞﹂亾闈欐鏃堕棿t=20/4=5s ...
绛旓細1.瑙 鐢卞凡鐭ヤ笅钀戒簡4S s=2/1gt^2=0.5*9.8*16=78.4m 鏁呰窛绂诲湴闈㈤珮搴︿负78.4m+200m=278.4m 鐢眘=1/2gt^2寰 t=鏍瑰彿(2s/g)=7.54s 2.瑙 褰撴苯杞﹀仠涓嬫潵鎵鐢ㄧ殑鏃堕棿涓 t=v/a=10/4=2.5s 鎵璧拌窛绂讳负 s=1/2at^2=0.5*4*2.5^2=12.5m 杩欎釜杩囩▼涓嚜琛岃溅鎵琛岃蛋鐨勮窛绂讳负 s=vt=...
绛旓細锛3锛夊０闊崇殑浼犳挱閫熷害340m/s 鍒欏北鐨勯珮搴 340*8=2720m 璁炬湯閫熷害涓簐 鍒 v^2=2gs=2*10*2720=54400 寰楀嚭v=233.2m/s
绛旓細绗16棰鍐欎笅杩囩▼,璋㈣阿銆楂樹竴鐗╃悊 鎴戞潵绛 1涓洖绛 #璇濋# 鎵撳伐浜哄繀鐪嬬殑鑱屽満銆庣淮鏉冦忔寚鍗!绁炵骇浜烘皬 楂樼矇绛斾富 2015-11-08 路 姣忎釜鍥炵瓟閮借秴鏈夋剰鎬濈殑 鐭ラ亾澶ф湁鍙负绛斾富 鍥炵瓟閲:8001 閲囩撼鐜:94% 甯姪鐨勪汉:1158涓 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 ...
