ÌâÄ¿ÄÚÈÝ
7£®Ä³ÎïÀíС×é¶ÔÇᵯ»ÉµÄµ¯ÐÔÊÆÄܽøÐÐ̽¾¿£¬ÊµÑé×°ÖÃÈçͼ¼×Ëùʾ£ºÇᵯ»É×ó¶Ë¹Ì¶¨£¬ÓÒ¶ËÓëÒ»Îï¿é½Ó´¥¶ø²»Á¬½Ó£¬Ö½´ø´©¹ý´òµã¼ÆʱÆ÷²¢ÓëÎï¿éÁ¬½Ó£®Ïò×óÍÆÎï¿éʹµ¯»ÉѹËõÒ»¶Î¾àÀ룬Óɾ²Ö¹ÊÍ·ÅÎï¿é£¬Í¨¹ý²âÁ¿ºÍ¼ÆË㣬¿ÉÇóµÃµ¯»É±»Ñ¹ËõºóµÄµ¯ÐÔÊÆÄÜÖèÈçÏ£ºA£®ÓÃÌìƽ²âÁ¿³öÎï¿éµÄÖÊÁ¿m£¬°´Í¼¼×Ëùʾ°²×°ºÃʵÑé×°Öã»
B£®Ïò×óÍÆÎï¿éʹµ¯»ÉѹËõ£¬²¢²âÁ¿µ¯»ÉѹËõÁ¿x£»
C£®°ÑÖ½´øÏò×óÀÖ±£¬½Óͨ´òµã¼ÆʱÆ÷µçÔ´£»
D£®ËÉÊÖÊÍ·ÅÎï¿é£®
£¨1£©Í¼ÒÒÊÇÎï¿éÍÑÀ뵯»Éºó´òµã¼ÆʱÆ÷Ëù´ò³öµÄÖ½´ø£¬Ã¿ÏàÁÚÁ½¸ö¼ÆÊýµãÖ®¼äÓÐ4¸öµãδ»³ö£®ÏàÁÚ¼ÆÊýµã¼äµÄ¾àÀëÈçͼÒÒËùʾ£®´òµã¼ÆʱÆ÷µçÔ´µÄƵÂÊΪ50Hz£¬ÔòÎï¿éÓë×ÀÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.2£¬ÕâÑùµÃµ½µÄ½á¹û±È¶¯Ä¦²ÁÒòÊýµÄÕæʵֵƫ´ó£¨Ìî¡°Æ«´ó¡±»ò¡°Æ«Ð¡¡±£©£®£¨g=10m/s2£©
£¨2£©ÈôÎï¿éÍÑÀ뵯»ÉʱµÄËÙ¶ÈΪv£¬Ôòµ¯»É±»Ñ¹Ëõʱ¾ßÓеĵ¯ÐÔÊÆÄÜ´óСÊÇ$\frac{1}{2}m{v}^{2}+¦Ìmgx$£®£¨ÓÃm¡¢g¡¢v¡¢xºÍ¶¯Ä¦²ÁÒòÊýÓæ̱íʾ£©
·ÖÎö £¨1£©¸ù¾ÝÁ¬ÐøÏàµÈʱ¼äÄÚµÄλÒÆÖ®²îÊÇÒ»ºãÁ¿Çó³ö¼ÓËٶȣ¬½áºÏÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö¶¯Ä¦²ÁÒòÊýµÄ´óС£®
£¨2£©¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉÇó³öµ¯»É±»Ñ¹Ëõʱ¾ßÓеĵ¯ÐÔÊÆÄÜ´óС£®
½â´ð ½â£º£¨1£©¸ù¾Ý¡÷x=aT2£¬ÔËÓÃÖð²î·¨µÃ£ºa=$\frac{£¨6.60+4.60-10.60-8.61£©¡Á1{0}^{-2}}{4¡Á0.01}$=-2.0m/s2£¬
¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɵ㺦Ìmg=ma£¬´úÈëÊý¾Ý½âµÃ£º¦Ì=0.2£®
ÒòΪֽ´øÓë´òµã¼ÆʱÆ÷¼äÒ²ÓÐĦ²Á£¬Ôò¼ÓËٶȵIJâÁ¿ÖµÆ«´ó£¬µ¼Ö¶¯Ä¦²ÁÒòÊýµÄ²âÁ¿ÖµÆ«´ó£®
£¨2£©¸ù¾ÝÄÜÁ¿Êغ㶨Âɵãº${E}_{p}=\frac{1}{2}m{v}^{2}+¦Ìmgx$£®
¹Ê´ð°¸Îª£º£¨1£©0.2£¬Æ«´ó£»£¨2£©$\frac{1}{2}m{v}^{2}+¦Ìmgx$£®
µãÆÀ ±¾Ì⿼²éÁËÅ£¶ÙµÚ¶þ¶¨ÂɺÍÄÜÁ¿ÊغãµÄ»ù±¾ÔËÓã¬Í¨¹ýÔȱäËÙÖ±ÏßÔ˶¯µÄÍÆÂÛÇó³ö¼ÓËٶȵĴóСÊǽâ¾ö±¾ÌâµÄ¹Ø¼ü£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
15£®Ä³ºá²¨ÔÚ½éÖÊÖÐÑØxÖáÕý·½Ïò´«²¥£¬t=0ʱ¿Ì£¬Oµã¿ªÊ¼ÏòÕý·½ÏòÔ˶¯£¬¾t=0.2s£¬OµãµÚÒ»´Îµ½´ïÕý·½Ïò×î´óλÒÆ´¦£¬Ä³Ê±¿ÌÐγɵIJ¨ÐÎÈçͼËùʾ£¬ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | ¸Ãºá²¨µÄ²¨ËÙΪ5 m/s | |
B£® | ¸Ã²¨ÐÎͼ¿ÉÄÜÊÇt=1.2 sʱ¿ÌµÄ | |
C£® | ÖʵãLÓëÖʵãN¶¼Ô˶¯ÆðÀ´ºó£¬ËüÃǵÄÔ˶¯·½Ïò×ÜÏà·´ | |
D£® | ÔÚ0.2 sµÄʱ¼äÄÚÖʵãMͨ¹ýµÄ·³ÌΪ20c m | |
E£® | ÔÚt=2.6 sʱ¿Ì£¬ÖʵãM´¦ÓÚƽºâλÖã¬ÕýÑØyÖáÕý·½ÏòÔ˶¯ |
2£®Èçͼ¼×Ëùʾ£¬ÀíÏë±äѹÆ÷Ô¡¢¸±ÏßȦµÄÔÑÊý±Èn1£ºn2=3£º1£¬L1¡¢L2ΪÁ½Ö»ÏàͬµÄµÆÅÝ£¬R¡¢L¡¢DºÍC·Ö±ðΪ¶¨Öµµç×è¡¢ÀíÏëÏßȦ¡¢ÀíÏë¶þ¼«¹ÜºÍµçÈÝÆ÷£¬ÆäÖÐC=10¦ÌF£®µ±ÔÏßȦÁ½¶Ë½ÓÈçͼÒÒËùʾµÄÕýÏÒ½»Á÷µçʱ£¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | µÆÅÝL1Ò»¶¨±ÈL2°µ | |
B£® | ¸±ÏßȦÁ½¶ËµÄµçѹÓÐЧֵΪ12 V | |
C£® | ÒòµçÈÝÆ÷ËùÔÚ֧·´¦ÓڶϷ״̬£¬¹ÊÎÞµçÁ÷ͨ¹ý¶þ¼«¹Ü | |
D£® | µçÈÝÆ÷CËù´øµçºÉÁ¿Îª1.2¡Á10-4C |
12£®ÓÃÒ»ÀíÏë±äѹÆ÷¸øÒ»¸ºÔع©µç£¬¸ºÔصç×èΪR£¬ÓÃÏÂÁÐÄÄÖÖ·½·¨¿ÉÒÔÔö¼Ó±äѹÆ÷µÄÊäÈ빦ÂÊ£¨¡¡¡¡£©
A£® | ¼õС¸ºÔصç×èRµÄ×èÖµ | B£® | Ôö¼ÓÔÏßȦµÄÔÑÊý | ||
C£® | ¼õС¸±ÏßȦµÄÔÑÊý | D£® | °ÑÔÏßȦµÄµ¼Ïß»»³É¸ü´ÖµÄµ¼Ïß |
19£®Èçͼ¼×Ëùʾ£¬ÀíÏë±äѹÆ÷Ô¸±ÏßȦµÄÔÑÊý±ÈΪ11£º1£¬¸øÒ»¸öСµÆÅݹ©µç£®µ±ÔÏßȦÊäÈëÈçͼÒÒËùʾÊÇÔÏßȦµÄÊäÈëµÄ½»±äµçѹ£¬Ð¡µÆÅÝÇ¡ºÃÕý³£·¢¹â£¬ÒÑÖªµÆÅݵĵç×èΪ20¦¸£¬Í¼Öеçѹ±íΪÀíÏëµç±í£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | ±äѹÆ÷Ô¸±ÏßȦµÄ´ÅͨÁ¿±ä»¯ÂÊÖ®±È11£º1 | |
B£® | µçѹ±íµÄʾÊýΪ220V | |
C£® | µÆÅݵĶ¹¦ÂÊΪ20W | |
D£® | ±äѹÆ÷ÊäÈëµçѹµÄ˲ʱֵ±í´ïʽΪU=220sin100¦Ðt |
16£®ÈçͼËùʾµç·ÖУ¬µ±»¬¶¯±ä×èÆ÷µÄ»¬Æ¬P´Óa¶ËÏòb¶Ë»¬¶¯Ê±£¬ÒÔÏÂÅжÏÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£® | µçѹ±í¶ÁÊý±ä´ó£¬Í¨¹ýµÆL1µÄµçÁ÷±ä´ó£¬µÆL2±äÁÁ | |
B£® | µçѹ±í¶ÁÊý±äС£¬Í¨¹ýµÆL1µÄµçÁ÷±äС£¬µÆL2±ä°µ | |
C£® | µçѹ±í¶ÁÊý±ä´ó£¬Í¨¹ýµÆL2µÄµçÁ÷±äС£¬µÆL1±ä°µ | |
D£® | µçѹ±í¶ÁÊý±äС£¬Í¨¹ýµÆL2µÄµçÁ÷±ä´ó£¬µÆL1±ä°µ |