ÌâÄ¿ÄÚÈÝ
Ëæ×ÅÉç»áµÄ·¢Õ¹£¬ÈËÃÇÉú»îˮƽµÄÌá¸ß£¬ÈËÃǵÄס·¿Ìõ¼þÒ²µÃµ½Á˺ܴóµÄ¸ÄÉÆ£®Ð¡Ã÷¼Ò×î½ü¹ºÖÃÁËÒ»Ì×з¿£¬ÎªÁË°ïÖú°Ö°Ö½«ÖØ600NµÄ×°ÐÞ²ÄÁÏÔËË͵½6m¸ßµÄÂ¥ÉÏ£¬Ð¡Ã÷ÀûÓÃÎïÀí¿ÎÉÏѧ¹ýµÄ»¬ÂÖ×飬Éè¼ÆÁËÈçͼ¼×ËùʾµÄ²ÄÁÏ°áÔË·½°¸£¨ÆäÖÐÿ¸ö»¬ÂÖÖØ30N£¬Éþ×Ó×ã¹»³¤£¬ËùÄܳÐÊܵÄ×î´óÀÁ¦Îª250N£¬²»¼ÆÉþÖؼ°Ä¦²Á£©£®£¨1£©¼ÆËã˵Ã÷Éþ×ÓµÄÀÁ¦ÊÇ·ñ³¬¹ýÉþ×ÓµÄ×î´ó³ÐÊÜÁ¦£¿
£¨2£©Ð¡Ã÷°Ö°Ö¹Û²ìÁ˸Ã×°Öúó£¬ËûÏëÈç¹û½«¸Ã×°ÖõĻ¬ÂÖλÖõߵ¹£¨Í¼ÒÒ£©ÊÇ·ñ»á¸üÊ¡Á¦Ò»Ð©£¬ÇëÄã°´ÕÕСÃ÷°Ö°ÖµÄÏë·¨£¬ÓñʻÏßÔÚÒÒͼÈÆÉÏÉþ×Ó²¢ËµÃ÷СÃ÷°Ö°ÖµÄÏë·¨ÊÇ·ñÕýÈ·£®
£¨3£©ÇóÁ½ÖÖ·½°¸µÄ»úеЧÂÊÖ®±È£¿
·ÖÎö£ºÕâÊÇÒ»µÀʵ¼ÊÓ¦ÓÃÌ⣬ҪÏÈ·ÖÎö»¬ÂÖ×éµÄ×é×°ÐÎʽ£¬µÃ³öÉþ×Ó¶ÎÊýn=3£¬È»ºó¸ù¾ÝÀÁ¦FºÍGÎï+G¶¯µÄ¹ØϵÅжÏÉþ×ÓÄÜ·ñ³ÐÊÜ£»Í¼ÒÒÉþ×ÓÈÆÏß·½·¨ÒªÀûÓá°Æ涯ż¶¨¡±ÔÔò»³ö£¬¿ÉÒÔ»4¶ÎÉþ×Ó£¬µ«²»Äܸı䷽Ïò£®
ÔÚ×îºóÒ»ÎÊÖУ¬ÒªÏÈÇó³öÁ½ÖÖ²»Í¬ÈÆ·¨ÏµĻ¬ÂÖ×éµÄ»úеЧÂÊ£¬È»ºóÔÙÇó³öËüÃǵıÈÖµ£®
ÔÚ×îºóÒ»ÎÊÖУ¬ÒªÏÈÇó³öÁ½ÖÖ²»Í¬ÈÆ·¨ÏµĻ¬ÂÖ×éµÄ»úеЧÂÊ£¬È»ºóÔÙÇó³öËüÃǵıÈÖµ£®
½â´ð£º½â£º£¨1£©F1=
£¨GÎï+G¶¯£©=
£¨600N+30N£©=210N£¬210N£¼250N£¬ÀÁ¦Ã»Óг¬¹ýÉþ×ÓµÄ×î´ó³ÐÊÜÁ¦£®
£¨2£©Éþ×ÓÈÆ·¨ÈçÏÂͼ£¬ËäȻʡÁ¦£¬µ«²»ÄܸıäÁ¦·½Ïò£¬ÈËÔڸߴ¦ºÜΣÏÕ£¬ÕâÖÖ·½·¨²»ÕýÈ·£®
£¨3£©¦Ç¼×=
=
=
£¬
F2=
£¨GÖØ+GÎ=
£¨600N+2¡Á30N£©=165N£¬
¦ÇÒÒ=
=
=
£¬
¦Ç¼×£º¦ÇÒÒ=
£º
=22£º21£»
´ð£º£¨1£©ÀÁ¦Ã»Óг¬¹ýÉþ×ÓµÄ×î´ó³ÐÊÜÁ¦£®
£¨2£©Éþ×ÓÈÆ·¨Èçͼ£¬ËäȻʡÁ¦£¬µ«²»ÄܸıäÁ¦·½Ïò£¬ÈËÔڸߴ¦ºÜΣÏÕ£¬ÕâÖÖ·½·¨²»ÕýÈ·£®
£¨3£©Á½ÖÖ·½°¸µÄ»úеЧÂÊÖ®±ÈΪ22£º21£®
1 |
n |
1 |
3 |
£¨2£©Éþ×ÓÈÆ·¨ÈçÏÂͼ£¬ËäȻʡÁ¦£¬µ«²»ÄܸıäÁ¦·½Ïò£¬ÈËÔڸߴ¦ºÜΣÏÕ£¬ÕâÖÖ·½·¨²»ÕýÈ·£®
£¨3£©¦Ç¼×=
GÎï |
nF1 |
600N |
3¡Á210N |
20 |
21 |
F2=
1 |
n |
1 |
4 |
¦ÇÒÒ=
GÎï |
nF2 |
600N |
4¡Á165N |
20 |
22 |
¦Ç¼×£º¦ÇÒÒ=
20 |
21 |
20 |
22 |
´ð£º£¨1£©ÀÁ¦Ã»Óг¬¹ýÉþ×ÓµÄ×î´ó³ÐÊÜÁ¦£®
£¨2£©Éþ×ÓÈÆ·¨Èçͼ£¬ËäȻʡÁ¦£¬µ«²»ÄܸıäÁ¦·½Ïò£¬ÈËÔڸߴ¦ºÜΣÏÕ£¬ÕâÖÖ·½·¨²»ÕýÈ·£®
£¨3£©Á½ÖÖ·½°¸µÄ»úеЧÂÊÖ®±ÈΪ22£º21£®
µãÆÀ£ºÏÖʵÉú»îÖеÄÌâÄ¿Òª¿¼ÂÇʵ¼ÊÇé¿ö£¬ÌرðÊǵڶþÎÊÖеĻ¬ÂÖ×é×°ÎÊÌâ¸üÒª·ûºÏʵ¼Ê£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿