ÌâÄ¿ÄÚÈÝ
£¨2008?¸£ÖÝÄ£Ä⣩ÈçͼËùʾ£¬Ò»¸öÖÊÁ¿Îªm£®µçºÉÁ¿qµÄ´øÕýµçÁ£×Ó£¨ÖØÁ¦ºöÂÔ²»¼Æ£©£¬´Ó¾²Ö¹¿ªÊ¼¾µçѹU1¼ÓËÙºó£¬ÑØˮƽ·½Ïò½øÈëˮƽ·ÅÖõÄÁ½Æ½ÐнðÊô°å¼ä£¬ÒÑÖª½ðÊô°å³¤ÎªL£¬Á½°å¼ä¾àd=
L£¬°å¼äµçѹU2=
U1£®Á£×ÓÀ뿪ƫתµç³¡ºó½øÈëÒ»¸ö´¹Ö±ÓÚÖ½ÃæµÄÔÈÇ¿´Å³¡£¬´Å³¡×óÓұ߽çÏß¾ùÔÚÊúÖ±·½ÏòÉÏ£¬Á£×ÓÔڴų¡ÖÐÔ˶¯µÄʱ¼äΪt£¬²¢Ç¡ºÃÑØˮƽ·½Ïò´Ó´Å³¡Óұ߽紩³ö£¬Çó£º
£¨1£©´øµçÁ£×ÓÀ뿪µç³¡Ê±Æ«ÀëÔÔ˶¯·½ÏòµÄ½Ç¶È¦È£»
£¨2£©´Å³¡BµÄ´óСºÍ·½Ïò£®
1 |
4 |
| ||
6 |
£¨1£©´øµçÁ£×ÓÀ뿪µç³¡Ê±Æ«ÀëÔÔ˶¯·½ÏòµÄ½Ç¶È¦È£»
£¨2£©´Å³¡BµÄ´óСºÍ·½Ïò£®
·ÖÎö£º£¨1£©Á£×Ó½øÈëƫתµç³¡ºó£¬×öÀàƽÅ×Ô˶¯£¬ÔËÓÃÔ˶¯µÄºÏ³ÉÓë·Ö½âÇó³öƫת½Ç£®
£¨2£©Á£×Ó½øÈë´Å³¡ºó£¬×öÔÈËÙÔ²ÖÜÔ˶¯£¬½áºÏÌõ¼þ£¬»³ö¹ì¼££¬Óɼ¸ºÎ֪ʶÇó°ë¾¶£¬ÔÙÇóBµÄ´óСÓë·½Ïò£®
£¨2£©Á£×Ó½øÈë´Å³¡ºó£¬×öÔÈËÙÔ²ÖÜÔ˶¯£¬½áºÏÌõ¼þ£¬»³ö¹ì¼££¬Óɼ¸ºÎ֪ʶÇó°ë¾¶£¬ÔÙÇóBµÄ´óСÓë·½Ïò£®
½â´ð£º½â£º
£¨1£©Éè´øµçÁ£×Ó¾U1µç³¡¼ÓËÙºóËÙ¶ÈΪvo£¬
Óɶ¯Äܶ¨Àí qU1=
mvo2-0
Á£×ÓÔڵ糡ÖÐÊܵ糡Á¦F=Eq£¬
ÇÒE=
×öÀàËÆƽÅ×Ô˶¯ÓУºvx=vo???
Òò?vy=at
Å£¶ÙµÚ¶þ¶¨ÂÉ£¬Ôòa=
ÓÖt=
Òò´Ë£¬tan¦È=
????
½âµÃ£ºtan¦È=
=
£»
ËùÒÔ¦È=30¡ã??????????????????????
£¨2£©Á£×ÓÔڴų¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÈçͼÓɼ¸ºÎ¹ØϵµÃ
Ô²»¡µÄÔ²ÐĽÇΪ¦È=30¡ã?????????????????????????????????
¹ÊÔ˶¯Ê±¼ät=
£¬?
¶øT=
???????????????
½âµÃ£ºB=
??????
·½Ïò´¹Ö±Ö½ÃæÏòÀï?
´ð£º£¨1£©´øµçÁ£×ÓÀ뿪µç³¡Ê±Æ«ÀëÔÔ˶¯·½ÏòµÄ½Ç¶È¦È=30¡ã£»
£¨2£©´Å³¡BµÄ´óС
£¬·½Ïò£º´¹Ö±Ö½ÃæÏòÀ?
£¨1£©Éè´øµçÁ£×Ó¾U1µç³¡¼ÓËÙºóËÙ¶ÈΪvo£¬
Óɶ¯Äܶ¨Àí qU1=
1 |
2 |
Á£×ÓÔڵ糡ÖÐÊܵ糡Á¦F=Eq£¬
ÇÒE=
U2 |
d |
×öÀàËÆƽÅ×Ô˶¯ÓУºvx=vo???
Òò?vy=at
Å£¶ÙµÚ¶þ¶¨ÂÉ£¬Ôòa=
F |
m |
ÓÖt=
L |
v0 |
Òò´Ë£¬tan¦È=
vy |
vx |
½âµÃ£ºtan¦È=
U2L |
2U1d |
| ||
3 |
ËùÒÔ¦È=30¡ã??????????????????????
£¨2£©Á£×ÓÔڴų¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÈçͼÓɼ¸ºÎ¹ØϵµÃ
Ô²»¡µÄÔ²ÐĽÇΪ¦È=30¡ã?????????????????????????????????
¹ÊÔ˶¯Ê±¼ät=
T |
12 |
¶øT=
2¦Ðm |
Bq |
½âµÃ£ºB=
¦Ðm |
6qt |
·½Ïò´¹Ö±Ö½ÃæÏòÀï?
´ð£º£¨1£©´øµçÁ£×ÓÀ뿪µç³¡Ê±Æ«ÀëÔÔ˶¯·½ÏòµÄ½Ç¶È¦È=30¡ã£»
£¨2£©´Å³¡BµÄ´óС
¦Ðm |
6qt |
µãÆÀ£º±¾ÌâÊÇ´øµçÁ£×ÓÔÚ×éºÏ³¡ÖÐÔ˶¯µÄÎÊÌ⣬¹Ø¼üÊÇ·ÖÎöÁ£×ÓµÄÊÜÁ¦Çé¿öºÍÔ˶¯Çé¿ö£¬ÓÃÁ¦Ñ§µÄ·½·¨´¦Àí£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿