ÌâÄ¿ÄÚÈÝ

ÈçͼËùʾ£¬¼×¡¢ÒÒÁ½¸öÕý·½Ìå·Ö±ð·ÅÖÃÔÚˮƽµØÃæÉÏ£¬ËüÃǸ÷×Ô¶ÔµØÃæµÄѹǿÏàµÈ£¬´óС¾ùΪP¡£¼×µÄÖÊÁ¿Îª5ǧ¿Ë£¬±ß³¤Îª0.1Ãס£Òҵı߳¤Îª0.05Ãס£Çó£º
£¨1£©¼×µÄÃܶȦѼף»           £¨2£©¼×¶ÔµØÃæµÄѹÁ¦F¼×ºÍѹǿP£»
£¨3£©Èô½«¼×¡¢ÒÒÖеÄÒ»¸öÎïÌåµþ·Åµ½ÁíÒ»¸öÎïÌåÉϱíÃæµÄÖÐÑëºó£¬Á½ÎïÌå¶ÔµØÃæµÄ
ѹǿΪP¡ä£¬Ôò¸úÔ­Ïȼ׶ԵØÃæµÄѹǿPÏà±È£¬Ð¡»ªÍ¬Ñ§ÔÚϱíÖÐÌá³öÁËÈýÖÖ²»Í¬µÄÉèÏë¡£
ÉèÏë
¢ñ
¢ò
¢ó
ÄÚÈÝ
P¡ä="2P"
P¡ä>2P
P¡ä<2P
 
£¨a£©ÇëÄãÅжϣ¬ÉèÏë¢ñÊÇ________µÄ£¬ÉèÏë¢òÊÇ________µÄ£¬ÉèÏë¢óÊÇ_______µÄ¡££¨¾ùÑ¡Ìî¡°¿ÉÄÜ¡±»ò¡°²»¿ÉÄÜ¡±£©
£¨b£©ÇëÑ¡ÔñÒ»¸ö¿ÉÄܵÄÉèÏ룬¼ÆËã³öÏàÓ¦µÄѹǿP¡ä¡£
1£©¦Ñ¼×=m¼× /V¼×                                                      
=5kg/(0.1m)3=5¡Á103kg/m3  ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
£¨2£©F¼×=G¼×=m¼×g                                                   
=5kg¡Á9.8N/kg="49N"   ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
P=F¼×/S¼×                                                     
="49N" /(0.1m)2 =4.9¡Á103 Pa   ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
£¨3£©£¨a£©ÉèÏë¢ñ²»¿ÉÄÜ£¬ÉèÏë¢ò¿ÉÄÜ£¬ÉèÏë¢ó¿ÉÄÜ ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­2·Ö
£¨b£©GÒÒ= FÒÒ= PSÒÒ=4.9¡Á103 Pa¡Á(0.05m)2=12.25N  ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
ÉèÏë¢ò£ºP¡ä="F¡ä/" SÒÒ="(49N+12.25N)/" (0.05m)2 =2.45¡Á104 Pa ¡­¡­¡­..¡­¡­1·Ö
ÉèÏë¢ó£ºP¡ä="F¡ä/" S¼×="(49N+12.25N)/" (0.1m)2 =6125Pa½âÎö:
ÂÔ
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

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

¾«Ó¢¼Ò½ÌÍø