ÌâÄ¿ÄÚÈÝ
1£®![](http://thumb.1010pic.com/pic3/quiz/images/201704/165/648ffb23.png)
¢ÙÏòÌå»ýΪV1µÄ´¿ÓÍËáÖмÓÈë¾Æ¾«£¬Ö±µ½ÓÍËá¾Æ¾«ÈÜÒº×ÜÌå»ýΪV2£»
¢ÚÓÃ×¢ÉäÆ÷³éÈ¡ÉÏÊöÈÜÒººóÒ»µÎ-µÎµØµÎÈËСÁ¿¼ò£¬µ±µÎÈënµÎʱÌå»ýΪV0£»
¢ÛÏÈÍù±ß³¤Îª30¡«40cmµÄdzÅÌÀïµ¹ÈË2cmÉîµÄË®£¬ÔÙÓÃ×¢ÉäÆ÷ÍùË®ÃæÉϵÎ1µÎÉÏÊöÈÜÒº£¬µÈÓÍËᱡĤÐÎ×´Îȶ¨ºó£®½«ÊÂÏÈ×¼±¸ºÃµÄ²£Á§°å·ÅÔÚdzÅÌÉÏ£¬²¢ÔÚ²£Á§°åÉÏÃè³öÓÍËᱡĤµÄÐÎ×´£¨ÈçͼËùʾ£©£»
¢Ü½«»ÓÐÓÍËᱡĤÂÖÀªÐÎ×´µÄ²£Á§°å£¬·ÅÔÚ»ÓÐÐí¶à±ß³¤ÎªaµÄСÕý·½ÐεÄ×ø±êÖ½ÉÏ£¬¼ÆËã³öÂÖÀª·¶Î§ÄÚµÄÃæ»ý£®
£¨1£©ÉÏÊö¹ý³ÌÖдæÔÚ´íÎó»òÒÅ©µÄ²½ÖèÐòºÅÊÇ¢Û£¬½«ðò×Ó·Û¾ùÔÈÈöÔÚË®ÃæÉÏ£»
£¨2£©Ò»µÎÉÏÊöÈÜÒºËùº¬´¿ÓÍËáµÄÌå»ýv=$\frac{{V}_{0}{V}_{1}}{n{V}_{2}}$
£¨3£©ÓÍËá·Ö×ÓÖ±¾¶µÄ±í´ïʽd=$\frac{{V}_{0}{V}_{1}}{8n{a}^{2}{V}_{2}}$£®
·ÖÎö ΪÁËÇå³þµØ¿´³öÓÍĤµÄÐÎ×´Ó¦ÔÚË®ÃæÉÏÈöÉÏðò×Ó·Û£»ÏÈÇó³ö1µÎÓÍËá¾Æ¾«ÈÜÒºÖд¿ÓÍËáµÄÌå»ý£¬ÔÙÓô¿ÓÍËáµÄÌå»ý³ýÒÔÓÍĤµÄÃæ»ý¼´µÃµ½ÓÍËá·Ö×ÓµÄÖ±¾¶£®
½â´ð ½â£º£¨1£©ÓÉʵÑé²½Öè¿ÉÖª£¬È±ÉÙµÄʵÑé²½ÖèÐòºÅÊÇ£º¢Û£¬Ó¦¸Ã¼ÓÈ룺½«ðò×Ó·Û¾ùÔÈÈöÔÚË®ÃæÉÏ£»
£¨2£©Ò»µÎÓÍËáÈÜÒºº¬Óд¿ÓÍËáµÄÌå»ýΪ£ºv=$\frac{{V}_{1}}{{V}_{2}}$¡Á$\frac{{V}_{0}}{n}$=$\frac{{V}_{0}{V}_{1}}{n{V}_{2}}$£»
£¨3£©ÓÍĤµÄÃæ»ýΪ£ºS=8¡Áa2=8a2£»
ÔòÓÍËá·Ö×ÓµÄÖ±¾¶Îª£ºd=$\frac{v}{S}$=$\frac{\frac{{V}_{0}{V}_{1}}{n{V}_{2}}}{8{a}^{2}}$=$\frac{{V}_{0}{V}_{1}}{8n{a}^{2}{V}_{2}}$£»
¹Ê´ð°¸Îª£º£¨1£©¢Û£¬½«ðò×Ó·Û¾ùÔÈÈöÔÚË®ÃæÉÏ£»£¨2£©$\frac{{V}_{0}{V}_{1}}{n{V}_{2}}$£»£¨3£©$\frac{{V}_{0}{V}_{1}}{8n{a}^{2}{V}_{2}}$£®
µãÆÀ ±¾Ì⿼²éÁËÓÍĤ·¨²â·Ö×ÓÖ±¾¶ÊÇʵÑé²½Öè¡¢Çó·Ö×ÓµÄÖ±¾¶£»ÒªÊìϤʵÑé²½ÖèÓëʵÑé×¢ÒâÊÂÏÇó·Ö×ÓÖ±¾¶Ê±£¬ÇóÓ͵ÄÌå»ýÊÇÒ×´íµã£¬Ò»¶¨Òª×¢ÒâËùÇóµÄÌå»ýÊÇ´¿Ó͵ÄÌå»ý£®½âÌâ½á¹û»¹Òª±£ÁôÓÐЧÊý×Ö£®
![](http://thumb2018.1010pic.com/images/loading.gif)
A£® | 7N£¬7N£¬8N | B£® | 1N£¬2N£¬3N | C£® | 4N£¬5N£¬10N | D£® | 1N£¬10N£¬10N |
![](http://thumb.1010pic.com/pic3/quiz/images/201704/132/a4bf21a4.png)
A£® | µ±R=10¦¸Ê±£¬R0ÏûºÄµÄ¹¦ÂÊ×î´ó£¬×î´óֵΪ$\frac{16}{169}$W | |
B£® | µ±R=1¦¸Ê±£¬µçÔ´µÄÊä³ö¹¦ÂÊ×î´ó£¬×î´óֵΪ2W | |
C£® | µ±R=3¦¸Ê±£¬RÏûºÄµÄ¹¦ÂÊ×î´ó£¬×î´óֵΪ$\frac{4}{3}$W | |
D£® | µ±R=10¦¸Ê±£¬µçÔ´µÄЧÂÊ×î´ó£¬×î´óֵΪ88% |
A£® | µç´Å²¨²»Äܱ»·´Éä | B£® | µç´Å²¨µÄ´«²¥²»ÐèÒª½éÖÊ | ||
C£® | ÊÖ»úÔÚʹÓÃʱ£¬²»·¢Éäµç´Å²¨ | D£® | ¦ÃÉäÏß²»Êǵç´Å²¨ |
![](http://thumb.1010pic.com/pic3/quiz/images/201705/2/f4ad45c8.png)
A£® | ĦÍгµA¶ÔԲ׶±ÚµÄѹÁ¦´óС´óÓÚĦÍгµB¶ÔԲ׶±ÚµÄѹÁ¦´óС | |
B£® | ĦÍгµAµÄÏßËٶȴóС´óÓÚĦÍгµBµÄÏßËٶȴóС | |
C£® | ĦÍгµAµÄ½ÇËٶȴóС´óÓÚĦÍгµBµÄ½ÇËٶȴóС | |
D£® | ĦÍгµAµÄÔ˶¯ÖÜÆÚ´óÓÚĦÍгµBµÄÔ˶¯ÖÜÆÚ |
![](http://thumb.1010pic.com/pic3/quiz/images/201502/242/69f56bc3.png)
A£® | S±ÕºÏʱ£¬D2ÏÈÁÁ£¬D1ºóÁÁ | |
B£® | S±ÕºÏʱ£¬D1¡¢D2ͬʱÁÁ£¬È»ºóD1ϨÃð | |
C£® | S¶Ï¿ªÊ±£¬D2Á¢¼´Ï¨Ãð£¬D1ÒªÁÁÒ»ÏÂÔÙϨÃð | |
D£® | S¶Ï¿ªÊ±£¬D1¡¢D2Ò»Æð»ºÂýϨÃð |