ÌâÄ¿ÄÚÈÝ

¡¾ÌâÄ¿¡¿°´³£¹æ£¬·É»úÔÚʧÊ£¬µ÷²éÈËÔ±×îÏÈ×öµÄÊÂÇé¾ÍÊǺÃËÑѰʧÊ·ɻúµÄ¡°ºÚÏ»×Ó¡±£¬Êµ¼ÊÉÏ£¬Í¨¹ýÄ£Äâ¿Õ£¨º££©ÄÑʹʵÄһϵÁг¬³£Ìõ¼þ£¬ÆÆ¿éÐÔÊÔÑ飬¿ÉÈ·±£¶Ô¡°ºÚÏ»×Ó¡±¿É¿¿ÐÔµÄ×ÛºÏ̽¾¿£®

£¨1£©¿¹´©Í¸ÐÔÊÔÑé

Ò»ÖÊÁ¿Îª250kgµÄ´ã»ð¸Ö¶§´Ó3m¸ßÂäÏÂÔÒÏò¡°ºÚÏ»×Ó¡±£®´ã»ð¸Ö¶§¶ÔºÚÏ»×Ó×öÁ˶àÉÙ¹¦£¿£¨gÈ¡10N/kg£©

£¨2£©·À»ðÊÔÑé

Éè¡°ºÚÏ»×Ó¡±ÖÊÁ¿Îª10kg£¬Íâ¿Ç²ÄÁϵıÈÈÈÈÝΪ502.8J/£¨kg¡æ£©£¬»·¾³Î¶ÈÊÇ20¡æ£¬È¼ÉÕ¹ý³ÌÖС°ºÚÏ»×Ó¡±¹²ÎüÈÈ5.43¡Á106J£¬ÊÔÇó¸Ã¡°ºÚÏ»×Ó¡±Òª½ÓÊܶàÉÙ¡æµÄ¸ßο¼Ñ飿

¡¾´ð°¸¡¿£¨1£©´ã»ð¸Ö¶§¶ÔºÚÏ»×Ó×öÁË7500JµÄ¹¦£»

£¨2£©¸Ã¡°ºÚÏ»×Ó¡±Òª½ÓÊÜ1100¡æµÄ¸ßο¼Ñ飮

¡¾½âÎö¡¿

ÊÔÌâ·ÖÎö£º£¨1£©ÀûÓÃG=mgÇó³ö´ã»ð¸Ö¶§µÄÖØÁ¦£¬È»ºóÀûÓÃW=Gh¼ÆËã´ã»ð¸Ö¶§¶ÔºÚÏ»×Ó×öµÄ¹¦£»

£¨2£©ÀûÓÃQ=cm¡÷t¼ÆËã³öζȱ仯Á¿£¬È»ºó¼ÓÉÏ»·¾³Î¶ȼ´¿ÉµÃµ½¸Ã¡°ºÚÏ»×Ó¡±Òª½ÓÊܶàÉÙ¡æµÄ¸ßο¼Ñ飮

½â£º£¨1£©´ã»ð¸Ö¶§µÄÖØÁ¦£º

G=mg=250kg¡Á10N/kg=2500N£¬

´ã»ð¸Ö¶§¶ÔºÚÏ»×Ó×öµÄ¹¦£º

W=Gh=2500N¡Á3m=7500J£»

£¨2£©¸ù¾ÝQ=cm¡÷t¿ÉµÃ£¬Î¶ȱ仯Á¿£º

¡÷t===1080¡æ£¬

»·¾³Î¶ÈÊÇ20¡æ£¬

ËùÒÔ£¬¸Ã¡°ºÚÏ»×Ó¡±Òª½ÓÊÜ1080¡æ+20¡æ=1100¡æµÄ¸ßο¼Ñ飮

´ð£º£¨1£©´ã»ð¸Ö¶§¶ÔºÚÏ»×Ó×öÁË7500JµÄ¹¦£»

£¨2£©¸Ã¡°ºÚÏ»×Ó¡±Òª½ÓÊÜ1100¡æµÄ¸ßο¼Ñ飮

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø