ÌâÄ¿ÄÚÈÝ
£¨2007?Î人ÈýÄ££©ÈçͼËùʾ£¬´Å¸ÐӦǿ¶È´óСΪB=0.15T¡¢·½Ïò´¹Ö±Ö½ÃæÏòÀïµÄÔÈÇ¿´Å³¡·Ö²¼Ôڰ뾶R=0.10mµÄÔ²ÐÎÇøÓòÄÚ£¬Ô²µÄ×ó¶Ë¸úyÖáÏàÇÐÓÚÖ±½Ç×ø±êϵԵãO£¬ÓҶ˸úÓ«¹âÆÁMNÏàÇÐÓÚxÖáÉϵÄAµã£®ÖÃÓÚÔµãOµÄÁ£×ÓÔ´¿ÉÑØxÖáÕý·½ÏòÉä³öËÙ¶Èv0=3.0¡Á106m/sµÄ´øÕýµçÁ£×ÓÁ÷£¬Á£×ÓÖØÁ¦²»¼Æ£¬±ÈºÉΪ
=1.0¡Á108C/kg£®ÏÖÒÔ¹ýOµã²¢´¹Ö±ÓÚÖ½ÃæµÄÖ±ÏßΪÖᣬ½«Ô²Ðδų¡ÄæʱÕ뻺ÂýÐýת90¡ã£¬Çó´Ë¹ý³ÌÖÐÁ£×Ó´òÔÚÓ«¹âÆÁÉϵķ¶Î§£®
q | m |
·ÖÎö£ºÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬½áºÏÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬¿ÉÈ·¶¨Ô˶¯°ë¾¶£»ÒÀ¾Ý¼¸ºÎ¹Øϵ£¬¿ÉÇó³ö×î´óλÒÆ£¬½ø¶ø¼´¿ÉÇó½â£®
½â´ð£º½â£ºÉèÁ£×ÓÔڴų¡ÖÐÑØOB»¡×öÔÈËÙÔ²ÖÜÔ˶¯µÄ°ë¾¶Îªr£¬
ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉq¦Ô0B=m
´úÈëÊý¾ÝµÃ r=
=0.20m ¢Ù
ÈçÉÏͼËùʾ£¬µ±Ô²µÄÖ±¾¶ODת¶¯µ½ÓëxÖáµÄ¼Ð½ÇΪ¦Áʱ£¬Á£×Ó´ÓÔ²Ðδų¡ÖеÄBµãÉä³ö£¬Á£×ÓÔڴų¡ÖеÄÆ«½ÇΪ¦È£¬´òÔÚÓ«¹âÆÁÉϵĵ㵽xÖáµÄ¾àÀëΪS£¬
Óɼ¸ºÎ֪ʶS=CAtan¦È¢Ú
CA=2R-OC¢Û
OC=rtan¦È¢Ü
ÁªÁ¢¢Ú¢Û¢Ü½âµÃ S=(2R-rtan
)tan¦È¢Ý
´úÈëÊý¾Ý²¢»¯¼òµÃ S=
m
¹Ê¦È×î´óʱ£¬S×î´ó
ÈçÏÂͼ£¬µ±DµãÓë³öÉäµãBÖغÏʱ£¬¦È×î´ó£®Óɼ¸ºÎ֪ʶsin
=
¢Þ
Óɢ٢޵à ¦È=60¡ã¢ß
½«¢Ù¢ß´úÈë¢Ý£¬ÇóµÃÁ£×Ó´òÔÚÓ«¹âÆÁÉÏ×îÔ¶µãµ½xÖáµÄ¾àÀëSmax=
m=0.15m
´Ëʱ ¦Á=
=30¡ã
µ±¦ÁÓÉ0¡ã±ä»¯µ½30¡ãµÄ¹ý³ÌÖУ¬¦ÈÖð½¥Ôö´ó£¬SÒ²Öð½¥Ôö´ó£»
µ±¦ÁÓÉ30¡ã±ä»¯µ½90¡ãµÄ¹ý³ÌÖУ¬¦ÈÖð½¥¼õСÖÁÁ㣬SÒ²Öð½¥¼õСÖÁÁ㣮
¹ÊÁ£×Ó´òÔÚÓ«¹âÆÁÉϵķ¶Î§SΪ0¡«0.15m£®
´ð£º¹ý³ÌÖÐÁ£×Ó´òÔÚÓ«¹âÆÁÉϵķ¶Î§Îª0¡«0.15m£®
ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉq¦Ô0B=m
¦Ô02 |
r |
´úÈëÊý¾ÝµÃ r=
m¦Ô0 |
qB |
ÈçÉÏͼËùʾ£¬µ±Ô²µÄÖ±¾¶ODת¶¯µ½ÓëxÖáµÄ¼Ð½ÇΪ¦Áʱ£¬Á£×Ó´ÓÔ²Ðδų¡ÖеÄBµãÉä³ö£¬Á£×ÓÔڴų¡ÖеÄÆ«½ÇΪ¦È£¬´òÔÚÓ«¹âÆÁÉϵĵ㵽xÖáµÄ¾àÀëΪS£¬
Óɼ¸ºÎ֪ʶS=CAtan¦È¢Ú
CA=2R-OC¢Û
OC=rtan¦È¢Ü
ÁªÁ¢¢Ú¢Û¢Ü½âµÃ S=(2R-rtan
¦È |
2 |
´úÈëÊý¾Ý²¢»¯¼òµÃ S=
0.40 | ||
1+cot
|
¹Ê¦È×î´óʱ£¬S×î´ó
ÈçÏÂͼ£¬µ±DµãÓë³öÉäµãBÖغÏʱ£¬¦È×î´ó£®Óɼ¸ºÎ֪ʶsin
¦È |
2 |
R |
r |
Óɢ٢޵à ¦È=60¡ã¢ß
½«¢Ù¢ß´úÈë¢Ý£¬ÇóµÃÁ£×Ó´òÔÚÓ«¹âÆÁÉÏ×îÔ¶µãµ½xÖáµÄ¾àÀëSmax=
| ||
5 |
´Ëʱ ¦Á=
¦È |
2 |
µ±¦ÁÓÉ0¡ã±ä»¯µ½30¡ãµÄ¹ý³ÌÖУ¬¦ÈÖð½¥Ôö´ó£¬SÒ²Öð½¥Ôö´ó£»
µ±¦ÁÓÉ30¡ã±ä»¯µ½90¡ãµÄ¹ý³ÌÖУ¬¦ÈÖð½¥¼õСÖÁÁ㣬SÒ²Öð½¥¼õСÖÁÁ㣮
¹ÊÁ£×Ó´òÔÚÓ«¹âÆÁÉϵķ¶Î§SΪ0¡«0.15m£®
´ð£º¹ý³ÌÖÐÁ£×Ó´òÔÚÓ«¹âÆÁÉϵķ¶Î§Îª0¡«0.15m£®
µãÆÀ£º¿¼²éÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬ÕÆÎÕÅ£¶ÙµÚ¶þ¶¨ÂÉÓëÏòÐÄÁ¦±í´ïʽ£¬Àí½â¼¸ºÎ¹ØϵÓëÔ˶¯¹ì¼£Í¼µÄÖØÒªÐÔ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿