ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾÖÊÁ¿Îª16ǧ¿ËµÄʵÐÄÕý·½Ìå·ÅÖÃÔÚˮƽ×ÀÃæÉÏ
£¨1£©ÈôÕý·½ÌåµÄÌå»ýΪ8¡Á10-3Ã×3ÇóËüµÄÃܶȣ¬
£¨2£©ÇóÕý·½Ìå¶Ô×ÀÃæµÄѹǿ¡£
£¨3£©ÈôÕý·½ÌåµÄ±ß³¤ÎªL£¬ÏÖÔÚÑØˮƽ·½ÏòÇÐÈ¥ºñ¶ÈΪ¡÷LµÄ¼×£¬Èçͼ£¨a£©Ëùʾ£¬È»ºó½«ÇÐÈ¥²¿·ÖÐýת90¶Èºóµþ¼ÓÔÚÊ£Óಿ·ÖÒҵıíÃæµÄÖÐÑ룬Èçͼ£¨b£©£¨c£©Ëùʾ¡£´Ëʱ¼×¶ÔÒÒµÄѹǿºÍÒÒ¶ÔµØÃæµÄѹǿ·Ö±ðΪp¼×¡¢pÒÒ£¬ Çëͨ¹ýÍƵ¼µÃ³öp¼×¡¢pÒÒ£¬µÄ´óС¹Øϵ¼°¡÷LµÄÈ¡Öµ·¶Î§¡£
¡¾´ð°¸¡¿2¡Á103ǧ¿Ë/Ã×3 3920ÅÁ £»0£¼¡÷l£¼l
¡¾½âÎö¡¿
£¨1£©ÖªµÀÕý·½ÌåµÄÌå»ýºÍÖÊÁ¿£¬ÀûÓÃÃܶȹ«Ê½ÇóÕý·½ÌåµÄÃܶȣ»
£¨2£©Õý·½Ìå¶ÔµØÃæµÄѹÁ¦µÈÓÚÆäÖØÁ¦£¬¸ù¾ÝÌå»ýÇó³öµ×Ãæ»ý£¬¼´ÊÜÁ¦Ãæ»ý£¬ÔÙÀûÓÃÇóÕý·½Ìå¶ÔµØÃæµÄѹǿ¡£
£¨2£©ÉèÕý·½ÌåµÄÖØÁ¦ÎªG£¬ÏÖÑØˮƽ·½ÏòÇÐÈ¥ºñ¶ÈΪ¡÷lµÄ²¿·Ö£¬Çó³ö¼×²¿·ÖµÄÖØÁ¦£¬¼×²¿·Ö¶ÔÒÒµÄѹÁ¦µÈÓÚ¼×µÄÖØÁ¦£¬Çó³ö½Ó´¥Ãæ»ý£¬ÀûÓÃѹǿ¹«Ê½Çó¼×¶ÔÒÒµÄѹǿ£»
ÒÒ¶ÔµØÃæµÄѹǿµÈÓÚ£¨2£©ÖÐÇó³öµÄѹǿ£¬½ø¶øµÃ³öѹǿ¹ØϵºÍ¡÷lµÄÈ¡Öµ·¶Î§¡£
£¨1£©Õý·½ÌåµÄÌå»ýV=8¡Á10-3m3£¬ÖÊÁ¿Îª16kg£¬
¸ù¾ÝµÃ£¬Õý·½ÌåµÄÃܶȣº
£¬
£¨2£©Õý·½ÌåµÄÌå»ýV=8¡Á10-3m3£¬
µÃ±ß³¤Îª£ºl=0.2m£¬µ×Ãæ»ýS=£¨0.2m£©2=0.04m2£¬
Õý·½Ìå¶ÔµØÃæµÄѹÁ¦£º
F=G=mg=16kg¡Á9.8N/kg=156.8N£¬
Õý·½Ìå¶ÔµØÃæµÄѹǿ£º
£»
£¨3£©ÉèÕû¸öÕý·½ÌåµÄÖØÁ¦ÎªG£¬Ôò¼×²¿·ÖµÄÖØÁ¦£º£¬
¼×²¿·Ö¶ÔÒÒµÄѹÁ¦£º£¬
½Ó´¥Ãæ»ý£¬
¼×¶ÔÒÒµÄѹǿ£º
ÒÒ¶ÔµØÃæµÄѹÁ¦£ºFÒÒ=G£¬
µØÃæµÄÊÜÁ¦Ãæ»ý£ºSÒÒ=l2£¬
ÒÒ¶ÔµØÃæµÄѹǿ£º£¬
ËùÒÔ£¬£¬
ÓÉÒÔÉÏ·ÖÎö¿ÉÖª£¬ÒÔÉϽáÂÛÖ»ÒªÔÚÕý·½Ìå±ß³¤µÄ·¶Î§ÄÚ£¬½áÂÛ¶¼»á³ÉÁ¢£¬¼´¡÷LµÄÈ¡Öµ·¶Î§Îª£º0£¼¡÷l£¼l¡£