ÌâÄ¿ÄÚÈÝ
11£®Ò»·½ÐÎľ°å·ÅÖÃÔÚˮƽµØÃæÉÏ£¬ÔÚ·½ÐÎľ°åµÄÉÏ·½ÓÐÒ»Ìõ×´ÊúÖ±µ²°å£¬µ²°åµÄÁ½¶Ë¹Ì¶¨ÔÚˮƽµØÃæÉÏ£¬µ²¸úľ°åÖ®¼ä²¢²»½Ó´¥£®ÏÖÔÚÓÐÒ»¸ö·½ÐÎÎï¿éÔÚľ°åÉÏÑص²°åÒÔijһËÙ¶ÈÔ˶¯£¬Í¬Ê±·½ÐÎľ°åÒÔÏàµÈ´óСµÄËÙ¶ÈÏò×óÔ˶¯£¬Ä¾°åµÄÔ˶¯·½ÏòÓëÊúÖ±µ²°å´¹Ö±£¬ÒÑÖªÎï¿é¸úÊúÖ±µ²°åºÍˮƽľ°å¼äµÄ¶¯Ä¦²ÁÒòÊý·Ö±ðΪ¦Ì1ºÍ¦Ì2£¬Îï¿éµÄÖÊÁ¿Îªm£¬ÔòÊúÖ±µ²°å¶ÔÎï¿éµÄĦ²ÁÁ¦´óСΪ£¨¡¡¡¡£©A£® | 0 | B£® | $\frac{\sqrt{2}}{2}$¦Ì1¦Ì2mg | C£® | $\frac{1}{2}$¦Ì1¦Ì2mg | D£® | $\sqrt{2}$¦Ì1¦Ì2mg |
·ÖÎö ·ÖÎöÎïÌåÏà¶ÔÓÚľ°åµÄÔ˶¯Çé¿ö£¬¸ù¾ÝĦ²ÁÁ¦¹«Ê½Çó³öĦ²ÁÁ¦µÄ´óС£¬¸ù¾ÝĦ²ÁÁ¦µÄÐÔÖÊÅжÏľ°å¶ÔÎïÌåµÄĦ²ÁÁ¦·½Ïò£»ÔÙ¶Ô»¬¿éÏà¶ÔÓÚµµ°åµÄÔ˶¯·ÖÎö£¬Çó³öѹÁ¦´óС£¬´Ó¶ø¸ù¾ÝĦ²ÁÁ¦¹«Ê½Çó³öµµ°å¶ÔÎï¿éµÄĦ²ÁÁ¦´óС£®
½â´ð ½â£ºÎïÌåÏà¶ÔÓÚľ°åµÄÔ˶¯·½ÏòÈçͼËùʾ£¬¸ù¾ÝÔ˶¯µÄºÏ³ÉºÍ·Ö½â¹æÂÉ¿ÉÖª£ºtan¦È=$\frac{{v}_{2}}{{v}_{1}}$=1£¬
½âµÃ£º¦È=45¡ã£»
ľ°å¶ÔÎïÌåµÄĦ²ÁÁ¦f2·½ÏòÓëvÏà¶Ô·½ÏòÏà·´£¬µµ°å¶ÔÎïÌåµÄÖ§³ÖÁ¦Îª£ºN2=f2sin¦È£¬ÆäÖÐf2=¦Ì2mg£¬
Ôòµµ°å¶ÔÎïÌåµÄĦ²ÁÁ¦´óСΪ£ºf1=¦Ì1N1£¬
f1=$\frac{\sqrt{2}}{2}$¦Ì1¦Ì2mg£»
¹ÊBÕýÈ·£¬ACD´íÎó£®
¹ÊÑ¡£ºB
µãÆÀ ±¾Ì⿼²éÔ˶¯µÄºÏ³ÉÓë·Ö½âÒÔ¼°Ä¦²ÁÁ¦µÄ¼ÆËãÎÊÌâ·ÖÎö£¬Òª×¢ÒâÃ÷È·Îï¿éÓëľ°å¼äµÄĦ²ÁÁ¦ÑØ´¹Ö±µµ°å·½ÏòÉϵķÖÁ¦³äµ±Ñ¹Á¦£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
2£®ÏÂÁÐÎïÀíÁ¿ÖÐÊôÓÚ±êÁ¿µÄÊÇ£¨¡¡¡¡£©
A£® | ´Å¸ÐӦǿ¶È | B£® | ´ÅͨÁ¿ | C£® | ¶¯Á¿ | D£® | ³åÁ¿ |
19£®ÓÎÀÖ³¡µÄÒ»ÖÖ»¬ÌÝ£¬ËüÊÇÓɺÜСһ¶Î»¡ÐιìµÀ½«Çãбֱ¹ìµÀºÍˮƽ¹ìµÀÁ¬½Ó×é³ÉµÄ£¬ÈçͼËùʾ£®Ò»Î»Ð¡ÅóÓÑ´Óб¹ìµÀ¶¥¶ËÓɾ²Ö¹¿ªÊ¼×ÔÓÉÏ»¬£¬¾¹ýºÜСһ¶Î»¡ÐιìµÀ»¬µ½Ë®Æ½¹ìµÀÉÏ£¬¼ÌÐø»¬¶¯Ò»¶Î¾àÀëºóͣϣ®ÔòСÅóÓÑ£¨¡¡¡¡£©
A£® | ÑØÇãб¹ìµÀÏ»¬¹ý³ÌÖÐÖØÁ¦ÊÆÄܼõС | |
B£® | ÑØˮƽ¹ìµÀ»¬¶¯¹ý³ÌÖУ¬ÖØÁ¦¶ÔËû×öÕý¹¦ | |
C£® | ÑØˮƽ¹ìµÀ»¬¶¯¹ý³ÌÖУ¬Ä¦²ÁÁ¦¶ÔËû×ö¸º¹¦ | |
D£® | ÔÚÕû¸ö»¬¶¯¹ý³ÌÖУ¬¹ìµÀ¶ÔËûµÄÖ§³ÖÁ¦¶¼²»×ö¹¦ |
6£®Óɾ²Ö¹¿ªÊ¼ÏÂÂäµÄÓêµÎ£¬Óöµ½Ë®Æ½·½Ïò´µÀ´µÄ·ç£¬Ôò£¨¡¡¡¡£©
A£® | ·çËÙÔ½´ó£¬ÓêµÎÏÂÂäʱ¼äÔ½³¤ | B£® | ·çËÙÔ½´ó£¬ÓêµÎÏÂÂäʱ¼äԽС | ||
C£® | ÓêµÎÏÂÂäʱ¼äÓë·çËÙ´óСÎÞ¹Ø | D£® | ÓêµÎ×ŵعý³Ì×öƽÅ×Ô˶¯ |
16£®ÈçͼËùʾµç·ÖУ¬¿ª¹ØS±ÕºÏ£®ÏÂÁдëÊ©ÖУ¬¿ÉÒÔʹµçÈÝÆ÷´øµçÁ¿Ôö¼ÓµÄÊÇ£¨¡¡¡¡£©
A£® | ¼õСµç×è | B£® | ¼õСÁ½°åÕý¶ÔÃæ»ý | ||
C£® | Ôö´ó°å¼ä¾àÀë | D£® | ¼õС°å¼ä¾àÀë |
2£®ÈçͼËùʾ£¬µç³ØµÄµç¶¯ÊÆΪE£¬ÄÚ×è²»¼Æ£¬ÏßȦ×Ô¸ÐϵÊý½Ï´ó£¬Ö±Á÷µç×è²»¼Æ£®µ±¿ª¹ØS±ÕºÏºó£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | a¡¢b¼äµçѹÖð½¥Ôö¼Ó£¬×îºóµÈÓÚE | B£® | b¡¢c¼äµçѹÖð½¥Ôö¼Ó£¬×îºóµÈÓÚE | ||
C£® | a¡¢c¼äµçѹÖð½¥Ôö¼Ó£¬×îºóµÈÓÚE | D£® | µç·ÖеçÁ÷Öð½¥Ôö¼Ó£¬×îºóµÈÓÚ$\frac{E}{R}$ |