ÌâÄ¿ÄÚÈÝ

£¨1£©Çóµç³¡Ç¿¶ÈEµÄ´óСºÍ·½Ïò£®
£¨2£©Èô½ö½ö³·È¥´Å³¡£®´øµçλ×ÓÈÔ´ÓOµãÒÔÏàͬµÄËÙ¶Èv0ÉäÈ룬¾µç³¡ÇøµÄ×îÓÒ²àµÄPµãÉä³ö£¬ÇóÁ£×ӱȺÉ
q | m |
£¨3£©Èô½ö½ö³·È¥µç³¡£®´øµçÁ£×ÓÈÔOµãÑØyÖáÕý·½ÏòÈëÉ䣮µ«ËٶȴóСΪ2v0£¬ÇóÁ£×ÓÔڴų¡ÖеÄÔ˶¯Ê±¼ä£®
·ÖÎö£º£¨1£©´øµçÁ£×ÓÔÚµç´Å³¡ÖÐ×öÔÈËÙÖ±ÏßÔ˶¯£¬µç³¡Á¦ÓëÂåÂ××ÈÁ¦Æ½ºâ£¬ÓÉƽºâÌõ¼þÇó³öEµÄ´óСºÍ·½Ïò£»
£¨2£©Èô½ö½ö³·È¥´Å³¡£¬´øµçÁ£×ÓÔÚÔÈÇ¿µç³¡ÖÐ×öÀàƽÅ×Ô˶¯£¬Ë®Æ½Î»ÒƺÍÊúֱλÒÆ´óС¶¼ÊÇR£¬¸ù¾ÝÀàƽÅ×Ô˶¯µÄ¹æÂÉÇó½â±ÈºÉ£»
£¨3£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÁ£×ӵĹ켣°ë¾¶£¬È·¶¨³ö¹ì¼£Ô²ÐĽǣ¬¼´¿ÉÇó³öʱ¼ä£®
£¨2£©Èô½ö½ö³·È¥´Å³¡£¬´øµçÁ£×ÓÔÚÔÈÇ¿µç³¡ÖÐ×öÀàƽÅ×Ô˶¯£¬Ë®Æ½Î»ÒƺÍÊúֱλÒÆ´óС¶¼ÊÇR£¬¸ù¾ÝÀàƽÅ×Ô˶¯µÄ¹æÂÉÇó½â±ÈºÉ£»
£¨3£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÁ£×ӵĹ켣°ë¾¶£¬È·¶¨³ö¹ì¼£Ô²ÐĽǣ¬¼´¿ÉÇó³öʱ¼ä£®
½â´ð£º½â£º£¨1£©´øµçÁ£×ÓÔÚµç´Å³¡ÖÐ×öÔÈËÙÖ±ÏßÔ˶¯£¬µç³¡Á¦ÓëÂåÂ××ÈÁ¦Æ½ºâ£¬ÓÉqv0B=qE£¬½âµÃE=v0B£¬·½ÏòÑØxÖáÕý·½Ïò£®£¨2£©´øµçÁ£×ÓÔÚÔÈÇ¿µç³¡ÖÐ×öÀàƽÅ×Ô˶¯£¬ÓÉÌâÓÐ
ÊúÖ±·½Ïò£ºR=v0t£¬
ˮƽ·½Ïò£ºR=
at2£¬qE=ma£¬
ÁªÁ¢½âµÃ£º
=
£¨3£©ÓÉq?2v0B=m
£¬½âµÃr=
=R£®
ÔòÖª´øµçÁ£×ÓÔڴų¡ÖÐÔ˶¯ËÄ·ÖÖ®Ò»ÖÜÆÚ£¬Ô˶¯Ê±¼ät=
=
´ð£º£¨1£©µç³¡Ç¿¶ÈEµÄ´óСΪv0B£¬·½ÏòÑØxÖáÕý·½Ïò£®
£¨2£©Èô½ö½ö³·È¥´Å³¡£®´øµçλ×ÓÈÔ´ÓOµãÒÔÏàͬµÄËÙ¶Èv0ÉäÈ룬¾µç³¡ÇøµÄ×îÓÒ²àµÄPµãÉä³ö£¬Á£×ӱȺÉ
µÈÓÚ
£®
£¨3£©Èô½ö½ö³·È¥µç³¡£®´øµçÁ£×ÓÈÔOµãÑØyÖáÕý·½ÏòÈëÉ䣮µ«ËٶȴóСΪ2v0£¬Á£×ÓÔڴų¡ÖеÄÔ˶¯Ê±¼äÊÇ
£®
ÊúÖ±·½Ïò£ºR=v0t£¬
ˮƽ·½Ïò£ºR=
1 |
2 |
ÁªÁ¢½âµÃ£º
q |
m |
2v0 |
BR |
£¨3£©ÓÉq?2v0B=m
(2v0)2 |
r |
2mv0 |
qB |
ÔòÖª´øµçÁ£×ÓÔڴų¡ÖÐÔ˶¯ËÄ·ÖÖ®Ò»ÖÜÆÚ£¬Ô˶¯Ê±¼ät=
| ||
2v0 |
¦ÐR |
4v0 |
´ð£º£¨1£©µç³¡Ç¿¶ÈEµÄ´óСΪv0B£¬·½ÏòÑØxÖáÕý·½Ïò£®
£¨2£©Èô½ö½ö³·È¥´Å³¡£®´øµçλ×ÓÈÔ´ÓOµãÒÔÏàͬµÄËÙ¶Èv0ÉäÈ룬¾µç³¡ÇøµÄ×îÓÒ²àµÄPµãÉä³ö£¬Á£×ӱȺÉ
q |
m |
2v0 |
BR |
£¨3£©Èô½ö½ö³·È¥µç³¡£®´øµçÁ£×ÓÈÔOµãÑØyÖáÕý·½ÏòÈëÉ䣮µ«ËٶȴóСΪ2v0£¬Á£×ÓÔڴų¡ÖеÄÔ˶¯Ê±¼äÊÇ
¦ÐR |
4v0 |
µãÆÀ£º½â´ð±¾ÌâµÄ¹Ø¼üÊÇ·ÖÎöÁ£×ÓµÄÊÜÁ¦Çé¿ö£¬ÔÙ·ÖÎöÔ˶¯Çé¿ö£®¶ÔÓÚÀàƽÅ×Ô˶¯ÒªÕÆÎÕ·Ö½âµÄ·½·¨£¬¶ÔÓÚÔÈËÙÔ²ÖÜÔ˶¯£¬ÔËÓü¸ºÎ֪ʶȷ¶¨Ô²ÐĽÇÊǹؼü£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿