4£®ÈçͼaËùʾװÖ㬲»¼ÆÉþµÄÖØÁ¦¼°Æ们ÂÖÖ®¼äµÄĦ²Á£¬ÎïÌåAµÄÖØÁ¦´Ó4N¿ªÊ¼Öð½¥Ôö¼Ó£¬Ã¿´ÎÀ­¶¯Éþ×Ó¾ùʹÎïÌåAÔÚ10sÄÚÔÈËÙÔ˶¯1m£®Í¼b¼Ç¼ÁË»¬ÂÖ×éµÄ»úеЧÂÊËæÎïÌåAµÄÖØÁ¦Ôö¼Ó¶ø±ä»¯µÄͼÏó£¬ÒÑÖªÎïÌåËùÊÜĦ²ÁÁ¦ÎªÖØÁ¦µÄ0.5±¶£®
Çë»Ø´ðÏÂÁÐÎÊÌ⣮
£¨1£©¶¯»¬ÂÖµÄÖØÁ¦Îª¶à´ó£¿
£¨2£©µ±ÎïÌåAµÄÖØÁ¦Îª12Nʱ£¬À­Á¦FµÄ¹¦ÂÊΪ¶à´ó£¿
£¨3£©µ±ÎïÌåAµÄÖØÁ¦Îª12Nʱ£¬»¬ÂÖ×éµÄ»úеЧÂÊΪ¶à´ó£¿

·ÖÎö £¨1£©µ±ÎïÌåÖØÁ¦G1=4Nʱ£¬f1=0.5G1£¬²»¼ÆÉþµÄÖØÁ¦¼°Æ们ÂÖÖ®¼äµÄĦ²Á£¬ÀûÓÃF=$\frac{1}{2}$£¨f+GÂÖ£©ÇóÀ­Á¦£¬ÀûÓæÇ1=$\frac{{W}_{ÓÐÓÃ1}}{{W}_{×Ü1}}$=$\frac{{f}_{1}{s}_{Îï}}{{F}_{1}s}$=$\frac{{f}_{1}{s}_{Îï}}{{F}_{1}2{s}_{Îï}}$=$\frac{{f}_{1}}{{f}_{1}+{G}_{ÂÖ}}$=50%Ç󶯻¬ÂÖÖØ£»
£¨2£©µ±ÎïÌåÖØÁ¦G2=12Nʱ£¬f2=0.5G2£¬²»¼ÆÉþµÄÖØÁ¦¼°Æ们ÂÖÖ®¼äµÄĦ²Á£¬ÀûÓÃF=$\frac{1}{2}$£¨f+GÂÖ£©ÇóÀ­Á¦£»Çó³ö10sÄÚÀ­Á¦¶ËÒƶ¯¾àÀ룬ÀûÓÃËٶȹ«Ê½ÇóÀ­Á¦¶ËÒƶ¯Ëٶȣ¬ÔÙÀûÓÃP=FvÇóÀ­Á¦¹¦ÂÊ£»
£¨3£©ÔÚ£¨2£©Çó³öÁËf2¡¢F2£¬ÀûÓæÇ2=$\frac{{W}_{ÓÐÓÃ2}}{{W}_{×Ü2}}$=$\frac{{f}_{2}}{2{F}_{2}}$Çó»úеЧÂÊ£®

½â´ð ½â£º
£¨1£©µ±ÎïÌåÖØÁ¦G1=4Nʱ£¬f1=0.5G1=0.5¡Á4N=1N£¬²»¼ÆÉþµÄÖØÁ¦¼°Æ们ÂÖÖ®¼äµÄĦ²Á£¬
À­Á¦£ºF1=$\frac{1}{2}$£¨f1+GÂÖ£©£¬
»úеЧÂÊ£º¦Ç1=$\frac{{W}_{ÓÐÓÃ1}}{{W}_{×Ü1}}$=$\frac{{f}_{1}{s}_{Îï}}{{F}_{1}s}$=$\frac{{f}_{1}{s}_{Îï}}{{F}_{1}2{s}_{Îï}}$=$\frac{{f}_{1}}{{f}_{1}+{G}_{ÂÖ}}$=$\frac{1N}{1N+{G}_{ÂÖ}}$=50%£¬
½âµÃ¶¯»¬ÂÖÖØGÂÖ=1N£»
£¨2£©µ±ÎïÌåÖØÁ¦G2=12Nʱ£¬f2=0.5G2=0.5¡Á12N=6N£¬²»¼ÆÉþµÄÖØÁ¦¼°Æ们ÂÖÖ®¼äµÄĦ²Á£¬
À­Á¦£ºF2=$\frac{1}{2}$£¨f2+GÂÖ£©=$\frac{1}{2}$£¨6N+1N£©=3.5N£¬
10sÄÚÀ­Á¦¶ËÒƶ¯¾àÀës=1m¡Á2m=2m£¬À­Á¦¶ËÒƶ¯ËÙ¶Èv=$\frac{s}{t}$=$\frac{2m}{10s}$=0.2m/s£¬
À­Á¦¹¦ÂÊ£ºP2=F2v=3.5N¡Á0.2m/s=0.7W£»
£¨3£©ÓÉ£¨2£©Öª£ºµ±ÎïÌåÖØÁ¦G2=12Nʱ£¬f2=6N£¬F2=3.5N£¬
»úеЧÂÊ£º¦Ç2=$\frac{{W}_{ÓÐÓÃ2}}{{W}_{×Ü2}}$=$\frac{{f}_{2}{s}_{Îï}}{{F}_{2}s}$=$\frac{{f}_{2}}{2{F}_{2}}$=$\frac{6N}{2¡Á3.5N}$¡Á100%¡Ö85.7%£®
´ð£º£¨1£©¶¯»¬ÂÖµÄÖØÁ¦Îª1N£»
£¨2£©µ±ÎïÌåAµÄÖØÁ¦Îª12Nʱ£¬À­Á¦FµÄ¹¦ÂÊΪ0.7W£»
£¨3£©µ±ÎïÌåAµÄÖØÁ¦Îª12Nʱ£¬»¬ÂÖ×éµÄ»úеЧÂÊΪ85.7%£®

µãÆÀ ±¾Ì⿼²éÁËʹÓû¬ÂÖ×éÀ­Á¦ºÍ»úеЧÂʵļÆË㣬¼ÆËãʱעÒâ±¾ÌâʹÓû¬ÂÖ×é²»ÊÇΪÁËÌáÉýÎïÖØ£¬¶øÊÇΪÁË¿Ë·þĦ²Á£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

14£®ÈçͼËùʾ£¬ËþʽÆðÖØ»úÉϵĻ¬ÂÖ×éÔÚ30sÄÚ½«ÖØΪ9.0¡Á103NµÄÖØÎïÔÈËÙµõÆð10m£¬×÷ÓÃÔÚÉþ¶ËµÄÀ­Á¦Îª4.0¡Á103N£®
£¨1£©ÇóÌáÉýÖØÎï×öµÄÓÐÓù¦ºÍÀ­Á¦¹¦ÂÊ£®
£¨2£©Çó»¬ÂÖ×éµÄ»úеЧÂÊ£®
£¨3£©Èô¿Ë·þĦ²ÁºÍ¸ÖË¿ÉþÖØËù×öµÄ¹¦ÎªÓÐÓù¦µÄ0.3±¶£¬Ç󶯻¬ÂÖµÄÖØ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

15£®ÈçͼËùʾ£¬»¬ÂÖÓëÉþ×Ó¼äµÄĦ²ÁºöÂÔ²»¼Æ£¬Ä³Í¬Ñ§ÀûÓû¬ÂÖ½«ÖØΪ200Å£µÄÎïÌåÔÚ20ÃëÄÚÔÈËÙÌá¸ß5Ã×£¬ÔòÎïÌåÔÚÉÏÉý¹ý³ÌÖУ¬À­Á¦Ëù×öµÄ¹¦Îª1000½¹£¬¹¦ÂÊΪ50Íߣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

12£®½«ÊԹܷÅÔÚ»ðÑæÉÏ¿¾Ò»»á¶ùºó£¬ÊÖÎÕסÊԹܵײ¿¿Ú³¯ÏÂÊúÖ±²åÈëË®ÖÐij´¦²»¶¯£¬ÔÚË®ÑØÊÔ¹ÜÉÏÉýµÄ¹ý³ÌÖУ¨¡¡¡¡£©
A£®ÊÔ¹ÜÄÚµÄÆøѹÖð½¥±äСB£®ÊÔ¹ÜÄÚµÄÆøѹÖð½¥±ä´ó
C£®ÊÖ¶ÔÊԹܵľ²Ä¦²ÁÁ¦Öð½¥±ä´óD£®Ë®±­¶ÔµØÃæµÄѹǿ²»±ä

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

19£®»¬¶¯Ä¦²ÁÁ¦µÄ´óСÓëÎïÌå¼äµÄѹÁ¦ºÍ½Ó´¥ÃæµÄ´Ö²Ú³Ì¶ÈÓйأ¬ÔÚÎïÀíѧÖУ¬¿ÉÒÔÓù«Ê½Ff=¦ÌFNÀ´¼ÆË㻬¶¯Ä¦²ÁÁ¦µÄ´óС£¬ÆäÖÐFf±íʾĦ²ÁÁ¦£¬FN´ú±íʾѹÁ¦£¬¦ÌÊÇÃèÊö½Ó´¥Ãæ´Ö²Ú³Ì¶ÈµÄÎïÀíÁ¿£¬½Ð¶¯Ä¦²ÁÒòÊý£¬ÈçͼËùʾ£¬´Ö²ÚµÄˮƽ×ÀÃæÉÏÓÐÒ»»¬¿é¼×£¬Í¨¹ýϸÉþÈƹý¶¨»¬ÂÖ£¬ÉþµÄÁíÒ»¶ËÐü¹ÒһСÇòÒÒ£¬ÒÑÖª¼×¡¢ÒÒ¶¼×öÔÈËÙÖ±ÏßÔ˶¯£¬¼×¡¢ÒÒµÄÖÊÁ¿·Ö±ðΪ50g¡¢20g£¬²»¼Æ»¬ÂÖÓëÉþµÄĦ²Á£¨gÈ¡10N/kg£©£®
£¨1£©ÓÃÁ¦µÄʾÒâͼ±íʾ³öÒÒÊܵ½µÄ¸÷¸öÁ¦¼°´óС£»
£¨2£©Ç󻬿éÓë×ÀÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¦ÌµÄ´óС£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

9£®µç¶¯»úµÄÔ­ÀíÊÇͨµçµ¼ÌåÔڴų¡ÖÐÊܵ½Á¦µÄ×÷Óã®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

16£®¸Ü¸ËOAÔÚÁ¦F1¡¢F2µÄ×÷ÓÃÏ´¦ÓÚƽºâ£¬ÔÚÈçͼÖл­³öÁ¦F2£®ºÍÁ¦F1µÄÁ¦±ÛL1£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

13£®Çë°´ÒªÇóÍê³ÉÒÔÏÂ×÷ͼ£®

£¨1£©Èçͼ1Ëùʾ£¬Çë»­³ö·´Éä¹âÏßÓëÕÛÉä¹âÏߣ®
£¨2£©Èçͼ2Ëùʾ£¬»­³ö×÷ÓÃÔÚAµã×îÊ¡Á¦µÄÓÃÁ¦·½Ïò£®
£¨3£©Èçͼ3Ëùʾ£¬±ê³öͨµçÂÝÏ߹ܵÄN¼«ºÍAµãµÄ´Å¸ÐÏß·½Ïò£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

14£®Ò»Á¾10tµÄ»õ³µ×ܹ²ÓÐ10¸öÂÖÌ¥£¬ÕýÔÚƽֱµÄ¹«Â·ÉÏÔÈËÙÐÐÊ»£¬ÒÑ֪ÿ¸öÂÖÌ¥ÓëµØÃæµÄ½Ó´¥Ãæ»ýΪ0.05m2£¬Æû³µËùÊܵÄ×èÁ¦ÊÇÆû³µ±¾ÉíÖØÁ¦µÄ0.02±¶£¬£¨g=10N/Kg£©Çó£º
£¨1£©Æû³µÊܵÄÖØÁ¦£»
£¨2£©Æû³µµÄÇ£ÒýÁ¦£»
£¨3£©Æû³µ¶Ô·ÃæµÄѹǿ£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸