ÌâÄ¿ÄÚÈÝ
17£®ÈçͼËùʾ£¬Ò»Ìõ²»¿ÉÉ쳤µÄÇáÉþÈƹý¹â»¬µÄÇáÖʶ¨»¬ÂÖ·Ö±ðÓëÎï¿éA¡¢BÏàÁ¬£¬Ï¸ÉþÁ½²¿·Ö·Ö±ð´¦ÓÚˮƽºÍÊúֱ״̬£¬×ÀÃæ¹â»¬£¬Îï¿éAºÍBµÄÖÊÁ¿·Ö±ðΪMºÍm£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£®ÏÖ½«ÏµÍ³Óɾ²Ö¹ÊÍ·Å£¬ÔÚBÂäµØÇ°£¬ÏÂÁÐÅжÏÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ÎïÌåBϽµµÄ¼ÓËٶȴóСΪ$\frac{mg}{M}$ | |
B£® | ÎïÌåBϽµµÄ¼ÓËٶȴóСΪ$\frac{mg}{M+m}$ | |
C£® | ÎïÌåA¶Ô×ÀÃæµÄѹÁ¦µÄ´óСµÈÓÚ×ÀÃæ¶ÔAµÄÖ§³ÖµÄ´óС | |
D£® | ÇáÉþµÄÕÅÁ¦Îªmg |
·ÖÎö ¸ôÀë·ÖÎö£¬ÔÚBÂäµØÇ°£¬×¥×¡A¡¢BµÄ¼ÓËٶȴóСÏàµÈ£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö¼ÓËٶȴóС£¬×÷ÓÃÁ¦Óë·´×÷ÓôóСÏàͬ£¬·½ÏòÏà·´
½â´ð ½â£ºA¡¢¶ÔB£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂɵÃmBg-T=mBa1
ͬÀí£¬¶ÔA£ºT=mAa1
½âµÃ${a}_{1}=\frac{mg}{M+m}$£¬F=$T=\frac{Mmg}{M+m}$¹ÊAD´íÎó£¬BÕýÈ·
C¡¢ÎïÌåA¶Ô×ÀÃæµÄѹÁ¦Óë×ÀÃæ¶ÔAµÄÖ§³ÖÁ¦Îª×÷ÓÃÁ¦ºÍ·´×÷ÓÃÁ¦£¬¹Ê´óСÏàµÈ£¬¹ÊCÕýÈ·£»
¹ÊÑ¡£ºBC
µãÆÀ ±¾Ì⿼²éÁËÅ£¶ÙµÚ¶þ¶¨ÂÉ£¬×¥×¡×÷ÓÃÁ¦Óë·´×÷ÓÃÁ¦´óСÏàͬ£¬·½ÏòÏà·´¼´¿É
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
7£®ÖÊÁ¿ÎªmµÄÆû³µÔÚƽֱµÄ·ÃæÉÏÆô¶¯£¬Æô¶¯¹ý³ÌµÄËÙ¶È-ʱ¼äͼÏóÈçͼËùʾ£¬ÆäÖÐOA¶ÎΪֱÏߣ¬AB¶ÎΪÇúÏߣ¬BµãºóΪƽÐÐÓÚºáÖáµÄÖ±Ïߣ®ÒÑÖª´Ót1ʱ¿Ì¿ªÊ¼Æû³µµÄ¹¦Âʱ£³Ö²»±ä£¬Õû¸öÔ˶¯¹ý³ÌÖÐÆû³µËùÊÜ×èÁ¦µÄ´óСºãΪFf£¬ÒÔÏÂ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | 0¡«t1ʱ¼äÄÚ£¬Æû³µÇ£ÒýÁ¦µÄÊýֵΪm$\frac{{v}_{1}}{{t}_{1}}$ | |
B£® | t1¡«t2ʱ¼äÄÚ£¬Æû³µµÄ¹¦ÂʵÈÓÚ£¨m$\frac{{v}_{1}}{{t}_{1}}$+Ff£©v2 | |
C£® | t1¡«t2ʱ¼äÄÚ£¬Æû³µµÄƽ¾ùËÙÂÊСÓÚ$\frac{{v}_{1}+{v}_{2}}{2}$ | |
D£® | Æû³µÔ˶¯µÄ×î´óËÙÂÊv2=£¨$\frac{m{v}_{1}}{{F}_{f}{t}_{1}}$+1£©v1 |
8£®ÃÀ¹úÎïÀíѧ¼ÒÃÜÁ¢¸ùͨ¹ýÑо¿Æ½Ðаå¼äÐü¸¡²»¶¯µÄ´øµçÓ͵Σ¬×¼È·µØ²â¶¨Á˵ç×ӵĵçºÉÁ¿£¬Èçͼ£¬Æ½ÐаåµçÈÝÆ÷Á½¼«°åM¡¢NÓëµçѹΪUµÄºã¶¨µçÔ´Á½¼«ÏàÁ¬£¬°åµÄ¼ä¾àΪd£®ÏÖÓÐÒ»ÖÊÁ¿ÎªmµÄ´øµçÓ͵ÎÔÚ¼«°å¼äÔÈËÙÏÂÂ䣬Ôò£¨¡¡¡¡£©
A£® | ´Ëʱ¼«°å¼äµÄµç³¡Ç¿¶ÈE=$\frac{U}{d}$ | |
B£® | Ó͵δøµçºÉÁ¿Îª$\frac{mg}{Ud}$ | |
C£® | ½«¼«°åNÏòÏ»ºÂýÒƶ¯Ò»Ð¡¶Î¾àÀ룬Ó͵ν«ÏòÉÏÔ˶¯ | |
D£® | ¼õС¼«°å¼äµçѹ£¬Ó͵ν«¼ÓËÙÏÂÂä |
12£®·É»ú×ÅÂäºóÒÔ´óСΪ6m/s2µÄ¼ÓËÙ¶È×öÔȼõËÙÖ±ÏßÔ˶¯£¬Æä×ÅÂäËÙ¶ÈΪ60m/s£¬ÔòËü×ÅÂäºó15sÄÚ»¬ÐеľàÀëΪ£¨¡¡¡¡£©
A£® | 225m | B£® | 300m | C£® | 450m | D£® | 400m |
2£®ÈçͼËùʾ£¬µçÔ´µç¶¯ÊÆE=3V£¬Ð¡µÆÅÝL±êÓС°2V£¬0.4W¡±£¬¿ª¹ØS½Ól£¬µ±±ä×èÆ÷µ÷µ½R=4¦¸Ê±£¬Ð¡µÆÅÝLÕý³£·¢¹â£»ÏÖ½«¿ª¹ØS½Ó2£¬Ð¡µÆÅÝLºÍµç¶¯»úM¾ùÕý³£¹¤×÷£®Ôò£¨¡¡¡¡£©
A£® | Á÷¹ýµç¶¯»úµÄµçÁ÷Ϊ0.2A | B£® | µç¶¯»úµÄÄÚ×èΪ4¦¸ | ||
C£® | µç¶¯»úÕý³£¹¤×÷µçѹΪ1V | D£® | µç¶¯»úµÄÊäÈ빦ÂÊΪ0.2W |
7£®Ò»¸öС¸ÖÇò´ÓÀëµØÃæ80mÀëµÄµØ·½Óɾ²Ö¹¿ªÊ¼ÏÂÂ䣬ºöÂÔ¿ÕÆø×èÁ¦£¬g=10m/s2£¬ÔòСÇòÔÚÏÂÂäºó3sÄ©µÄËٶȺÍÀëµØÃæµÄ¸ß¶È·Ö±ðÊÇ£¨¡¡¡¡£©
A£® | 30m/s 45m | B£® | 40m/s 45m | C£® | 30m/s 35m | D£® | 40m/s 35m |