ÌâÄ¿ÄÚÈÝ
7£®¹ØÓÚ̽¾¿ÓëÎïÌåËٶȱ仯µÄ¹ØϵµÄʵÑ飨1£©ÏÂÁÐÐðÊöÕýÈ·µÄÊÇBC
A£®ÓÉÓÚС³µ»áÊܵ½×èÁ¦µÄ×÷Óã¬Çãбľ°åÊÇΪÁËÊÍ·ÅС³µºó£¬Ð¡³µÄܹ»×ÔÓÉÏ»¬
B£®ÊµÑéÖУ¬Ã¿´ÎÒª°ÑС³µÀµ½Í¬Ò»Î»ÖÃÊÍ·Å
C£®ÏȽÓͨµçÔ´£¬ÔÙÈÃС³µÔÚÏðƤ½îµÄ×÷ÓÃϵ¯³ö
D£®Ã¿´ÎʵÑé±ØÐëÉè·¨Ëã³öÏðƤ½î¶ÔС³µ×ö¹¦µÄ¾ßÌåÊýÖµ
£¨2£©ÎªÁ˼ÆËãÓÉÓÚÏðƤ½î×ö¹¦¶øʹС³µ»ñµÃµÄËٶȣ¬Ñ¡È¡ÁËʵÑéÖÐij´ÎµÃµ½µÄÒ»ÌõÖ½´ø£¬Èçͼ1Ëùʾ£¬ÒÑÖª´òµã¼ÆʱÆ÷½Ó50Hz½»Á÷µç£¬È¡g=10m/s2£¬ÇóµÃС³µ»ñµÃµÄËÙ¶ÈΪ2.00m/s£®£¨±£Áô3λÓÐЧÊý×Ö£©
£¨3£©Èô¸ù¾Ý¶à´Î²âÁ¿Êý¾Ý»³öµÄW-vͼÏóÈçͼ2Ëùʾ£¬¸ù¾ÝͼÏßÐÎ×´¿ÉÖª£¬¶ÔWÓëvµÄ¹Øϵ×÷³ö²ÂÏë¿ÉÄÜÕýÈ·µÄÊÇCD
A£®W¡Ø$\sqrt{v}$ B£®W¡Ø$\frac{1}{v}$ C£®W¡Øv2 D£®W¡Øv3
·ÖÎö £¨1£©ÊµÑéÖ±½ÓÈ¥²âÁ¿Ò»¸ö×ö±äËÙÔ˶¯ÎïÌåËùÊÜÀÁ¦ÊǺÜÀ§Äѵģ®ÏðƤ½îÀ¶¯Ð¡³µµÄµ¯Á¦ËäÈ»ÊǸö±äÁ¦£¬µ«Õâ¸öµ¯Á¦×öµÄ¹¦£¬ÊýÖµÉϾ͵ÈÓÚÏðƤ½î·¢ÉúÐαäʱËù¾ßµÄµ¯ÐÔÊÆÄÜ£¬¶øÕâ¸öµ¯ÐÔÊÆÄÜÓÖÓëÏðƤ½îµÄÐαäÁ¿Ïà¶ÔÓ¦£»ÏðƤ½îµÄÐαäÁ¿Ò»¶¨£¬Õâ¸öµ¯Á¦×öµÄ¹¦¾ÍÊÇÒ»¶¨µÄ£®ÊµÑéʱ£¬Ã¿´Î±£³ÖÏðƤ½îµÄÐαäÁ¿Ò»¶¨£¬µ±ÓÐn¸ùÏàͬÏðƤ½î²¢ÏµÔÚС³µÉÏʱ£¬n¸ùÏàͬÏðƤ½î¶ÔС³µ×öµÄ¹¦¾ÍµÈÓÚϵһ¸ùÏðƤ½îʱ¶ÔС³µ×öµÄ¹¦µÄn±¶£¬Õâ¸öÉè¼ÆºÜÇÉÃîµØ½â¾öÁËÖ±½ÓÈ¥²âÁ¿Á¦ºÍ¼ÆË㹦µÄÀ§ÄÑ£¬ÔÙ¼ÓÉÏ´òµã¼ÆʱÆ÷²â³öС³µ»ñµÃµÄ×î´óËٶȼ´¶¯ÄÜ¿ÉÇó£»
£¨2£©ÓÉÓÚÒªÅжÏÏðƤÌõËù×öµÄ¹¦ÓëËٶȱ仯µÄ¹Øϵ£¬¹ÊÐèÒª²âÁ¿³ö¼ÓËÙµÄÄ©Ëٶȣ¬¼´×î´óËٶȣ¬Ò²¾ÍÊÇÔÈËÙÔ˶¯µÄËٶȣ¬ËùÒÔÒª·ÖÎöµã¼£¾ùÔȵÄÒ»¶ÎÖ½´ø£»
£¨3£©¸ù¾ÝͼÏóÌص㣬ÀûÓÃÊýѧ֪ʶ¿ÉÕýÈ·µÃ³ö½áÂÛ£®
½â´ð ½â£º£¨1£©A¡¢Çãбľ°åÊÇΪÁËƽºâĦ²Á£¬ÇáÍÆС³µ£¬Ð¡³µÄÜÔÈËÙÏ»¬£¬¹ÊA´íÎó£»
B¡¢Ã¿´ÎʵÑéÖУ¬ÏðƤ½îÀÉìµÄ³¤¶ÈÒ»¶¨Òª±£³ÖÒ»Ö£¬ËùÒÔʵÑéÖУ¬Ã¿´ÎÒª°ÑС³µÀµ½Í¬Ò»Î»ÖÃÊÍ·Å£¬¹ÊBÕýÈ·£»
C¡¢ÏȽÓͨµçÔ´£¬ÔÙÈÃС³µÔÚÏðƤ½îµÄ×÷ÓÃϵ¯³ö£¬¹ÊCÕýÈ·£»
D¡¢ÎÒÃÇÓÃÏðƤ½îÀ¶¯Ð¡³µµÄ·½·¨£¬À´Ì½¾¿ÏðƤ½îµÄÀÁ¦¶ÔС³µËù×öµÄ¹¦ÓëС³µËٶȱ仯µÄ¹Øϵ£¬ÕâÊÇÒ»¸ö·Ç³£¾«ÃîµÄÉè¼Æ£®Ö±½ÓÈ¥²âÁ¿Ò»¸öÕý×ö±äËÙÔ˶¯ÎïÌåËùÊÜÀÁ¦ÊǺÜÀ§Äѵģ®ÏðƤ½îÀ¶¯Ð¡³µµÄµ¯Á¦ËäÈ»ÊǸö±äÁ¦£¬µ«Õâ¸öµ¯Á¦×öµÄ¹¦£¬ÊýÖµÉϾ͵ÈÓÚÏðƤ½î·¢ÉúÐαäʱËù¾ßµÄµ¯ÐÔÊÆÄÜ£¬¶øÕâ¸öµ¯ÐÔÊÆÄÜÓÖÓëÏðƤ½îµÄÐαäÁ¿Ïà¶ÔÓ¦£»ÏðƤ½îµÄÐαäÁ¿Ò»¶¨£¬Õâ¸öµ¯Á¦×öµÄ¹¦¾ÍÊÇÒ»¶¨µÄ£®ÊµÑéʱ£¬ÎÒÃÇÔö¼ÓÏàͬµÄÏðƤÌõµÄÊýÁ¿£¬Ê¹¹¦µÄ´óС³É±¶ÊýÔö¼Ó£¬Ã¿´ÎʵÑé²»±ØÉè·¨Ëã³öÏðƤ½î¶ÔС³µ×ö¹¦µÄ¾ßÌåÊýÖµ£¬¹ÊD´íÎó£®
¹ÊÑ¡£ºBC
£¨2£©ÔÚ¼ÓËÙ¹ý³ÌÖУ¬ÏðƤÌõÔÚ×öÕý¹¦£¬¹ÊÐèÒª²âÁ¿×î´óËٶȣ¬¼´ÔÈËÙÔ˶¯µÄËٶȣ¬Òò¶øÐèҪѡÓüä¸ô¾ùÔȵĵ㣬
ÔòС³µ»ñµÃµÄËÙ¶Èv=$\frac{x}{t}=\frac{4.00¡Á1{0}^{-2}}{0.02}=2.00m/s$£¬
£¨3£©Èô¸ù¾Ý¶à´Î²âÁ¿Êý¾Ý»³öµÄW-vͼÏóÈçͼ2Ëùʾ£¬¸ù¾ÝͼÏßÐÎ×´¿ÉÖª£¬¸Ãº¯ÊýÊÇÃݺ¯Êý£¬¿ÉÒÔд³É£ºW=vn£¬ÓÉÓÚº¯ÊýµÄÇúÏßÏòÉÏÍäÇú£¬ËùÒÔn£¾1£¬¶ÔWÓëvµÄ¹Øϵ×ö³öµÄ²ÂÏë¿Ï¶¨²»ÕýÈ·µÄÊÇAºÍB£¬CºÍDÊÇ¿ÉÄܵģ®
¹ÊÑ¡£ºCD
¹Ê´ð°¸Îª£º£¨1£©BC£»£¨2£©2.00£»£¨3£©CD
µãÆÀ ±¾ÊµÑéµ±ÖйؼüµÄÊÇÈçºÎʵÏÖÈù¦³É±¶µÄÔö¼Ó£¬ÈçºÎ²âµ½Ð¡³µ»ñµÃµÄ×î´óËٶȣ®ÏðƤ½îÀ¶¯Ð¡³µµÄÉè¼ÆÇÉÃîµØ½â¾öÁËÕâ¸öÎÊÌ⣬ѡÏîÖÐÉæ¼°µ½ÊµÑéµÄ¼¸¸öϸ½Ú£¬ÊÇÒ»µÀÒ×´íÌ⣮
A£® | ÇòµÄ»úеÄÜÊغã | |
B£® | ÇòµÄ¶¯ÄÜÏÈÔö´óºó¼õС£¬»úеÄÜÒ»Ö±Ôö¼Ó | |
C£® | ÇòÍÑÀ뵯»Éʱµ¯»ÉµÄ³¤¶ÈСÓÚÔ³¤ | |
D£® | ÇòÔÚ¸ÕÍÑÀ뵯»Éʱ¶¯ÄÜ×î´ó |
A£® | µç³¡Á¦µÄ¹¦ | |
B£® | µç³¡Á¦µÄ¹¦ÓëµãµçºÉ´øµçÁ¿µÄ±ÈÖµ | |
C£® | µçÊÆÄܵı仯Á¿ | |
D£® | µçÊÆÄܱ仯Á¿ÓëµãµçºÉ´øµçÁ¿µÄ±ÈÖµ |
A£® | A¡¢BÁ½µãµÄµç³¡Ç¿¶ÈEA£¾EB | B£® | µç×ÓÔÚA¡¢BÁ½µãµÄËÙ¶ÈvA£¾vB | ||
C£® | A¡¢BÁ½µãµÄµçÊƦÕA£¾¦ÕB | D£® | µç×ÓÔÚA£¬BÁ½µãµÄµçÊÆÄÜEPA£¼EPB |
A£® | 3R | B£® | $\frac{4R}{3}$ | C£® | $\frac{R}{3}$ | D£® | 1.5R |
A£® | ½ÓÔÚ¼×µçÔ´ÉÏʱ£¬¶¨Öµµç×èRÉϵĵçÁ÷½Ï´ó | |
B£® | ½ÓÔÚ¼×µçÔ´ÉÏʱ£¬µçÔ´Êä³ö¹¦Âʽϴó | |
C£® | ½ÓÔÚÒÒµçÔ´ÉÏʱ£¬µçÔ´ÏûºÄµÄ¹¦Âʽϴó | |
D£® | ½ÓÔÚÒÒµçÔ´ÉÏʱ£¬¶¨Öµµç×èRÉϵĵçѹ½ÏС |