Question

1£®Ä³ÊµÑéС×éÔÚ¡°²â»¬ÂÖ×é»úеЧÂÊ¡±µÄʵÑéÖеõ½µÄÊý¾ÝÈçϱíËùʾ£¬µÚ1¡¢2¡¢3´ÎʵÑé×°Ö÷ֱðÈçͼ¼×¡¢ÒÒ¡¢±ûËùʾ£®

´ÎÊý	¹³ÂëÖØG/N	¹³ÂëÉÏÉý¸ß¶Èh/m	ÓÐÓÃW ÓÐ/J	²âÁ¦¼ÆÀ­Á¦F/N	²âÁ¦¼ÆÒƶ¯¾àÀës/m	×ܹ¦W×Ü/J	»úеЧÂÊh
1	2	0.1	0.2	0.9	0.3	0.27	74.1%
2	4	0.1	0.4	l.6	0.3	0.48	83.3%
3	4	0.1		1£®l	0.5	0.55

£¨1£©±È½ÏµÚ1´ÎʵÑéºÍµÚ2´ÎʵÑ飬¿ÉµÃ½áÂÛ£ºÊ¹ÓÃͬÑùµÄ»¬ÂÖ×飬ÌáÆðµÄ¹³ÂëÔ½ÖØ£¬»¬ÂÖ×éµÄ»úеЧÂÊÔ½¸ß£®
£¨2£©µÚ3´ÎʵÑéÖÐËù×öµÄÓÐÓù¦ÊÇ0.4 J£¬»úеЧÂÊÊÇ72.7%£®
£¨3£©µÚ3´ÎʵÑéÖж¯»¬ÂÖ¸öÊý±ÈµÚ2´ÎʵÑé¶à£¬¶¯»¬ÂÖ×ÔÖØÔö´ó£¬¶Ô¶¯»¬ÂÖËù×öµÄ¶îÍ⹦Ôö´ó  £¨Ñ¡Ìî¡°Ôö´ó¡±»ò¡°¼õС¡±£©£¬Òò¶ø£¬ÓɵÚ2¡¢3´ÎʵÑé¿ÉÖª£º»¬ÂÖ×éµÄ»úеЧÂÊÓ붯»¬ÂÖ×ÔÖØ´óСÓйأ®
£¨4£©×ÛºÏÉÏÊö½áÂÛ£¬Ìá¸ß»úеЧÂʵķ½·¨ÓÐÔö´óÓÐÓù¦£¬¼õС ¶îÍ⹦£¨Ñ¡Ìî¡°Ôö´ó¡±»ò¡°¼õС¡±£©£®

Answer 1

·ÖÎö £¨1£©±È½ÏµÚ1´ÎʵÑéºÍµÚ2´ÎʵÑ飬¹³ÂëÉý¸ßµÄ¾àÀëÏàͬ£¬Éþ×Ó×ÔÓɶËÒƶ¯µÄ¾àÀëÏàͬ£¬ËµÃ÷ʹÓõÄÊÇͬһװÖã¬Ëù×öµÄ¶îÍ⹦Ïàͬ£¬ÌáÆðµÄÖØÎﲻͬ£¬»úеЧÂʲ»Í¬¾Ý´ËµÃ³ö½áÂÛ£®
£¨2£©¸ù¾ÝW=GhÇó³öµÚ3´ÎʵÑéµÄÓÐÓù¦£¬¸ù¾ÝW_×Ü=FsÇó³ö×ܹ¦£¬¸ù¾Ý»úеЧÂʹ«Ê½Çó³öЧÂʵĴóС£®
£¨3£©ÌáÆðµÄÖØÎïÏàͬ£¬Éý¸ßµÄ¾àÀëÏàͬ£¬ÓÐÓù¦Ïàͬ£¬¶¯»¬ÂÖÔ½ÖØ£¬¶îÍ⹦Ôö´ó£¬×ܹ¦Ôö´ó£¬»úеЧÂÊԽС£®ËùÒÔ»¬ÂÖ×éµÄ»úеЧÂʸú¶¯»¬ÂÖµÄÖØÓйأ®
£¨4£©Òª½â´ð´ËÌâÊ×ÏÈÒªÖªµÀ»úеЧÂʵĸÅÄî---ÓÐÓù¦Óë×ܹ¦µÄ±ÈÖµ£¬ÒªÌá¸ß»úеЧÂʾÍÊÇÒªÌá¸ßÓÐÓù¦ÔÚ×ܹ¦ÖÐËùÕ¼µÄ±ÈÀý£¬³ýÁËÔö´óÓÐÓù¦Ö®Í⣬»¹¿ÉÒÔ¼õС¶îÍ⹦£®

½â´ð ½â£º£¨1£©±È½ÏµÚ1´ÎʵÑéºÍµÚ2´ÎʵÑé¿ÉÖª£¬¼×ÒÒÊÇͬһ¸ö»¬ÂÖ×飬¼×ÌáÆð2NµÄÎïÌ壬ÒÒÌáÆð4NµÄÎïÌ壬ÆäËûµÄÌõ¼þÏàͬ£¬¼×µÄ»úеЧÂÊÊÇ74.1%£¬ÒҵĻúеЧÂÊÊÇ83.3%£¬ËùÒÔ£¬Ê¹ÓÃͬÑùµÄ»¬ÂÖ×飬ÌáÆðµÄ¹³ÂëÔ½ÖØ£¬»¬ÂÖ×éµÄ»úеЧÂÊÔ½¸ß£®
£¨2£©µÚ3´ÎʵÑéÖУº
ÓÐÓù¦£ºW_ÓÐ=Gh=4N¡Á0.1m=0.4J£¬
s=0.5m£¬
W_×Ü=Fs=1.1N¡Á0.5m=0.55J£¬
»úеЧÂÊ£º¦Ç=$\frac{{W}_{ÓÐÓÃ}}{{W}_{×Ü}}$¡Á100%=$\frac{0.4J}{0.55J}$¡Á100%=72.7%£»
£¨3£©ÓÉʵÑé2¡¢3µÃ£¬ÓÐÓù¦Ïàͬ£¬×ܹ¦Ôö´ó£¬¶îÍ⹦Ôö´ó£¬»úеЧÂʽµµÍ£»ËùÒÔ»¬ÂÖ×éµÄ»úеЧÂʸú¶¯»¬ÂÖµÄÖØÓйأ»
£¨4£©ÒªÌá¸ß»úеЧÂÊ£¬³ýÁËÔö´óÎïÖØÒÔÔö´óÓÐÓù¦Ö®Í⣬»¹¿ÉÒÔ¼õС¶îÍ⹦£®ÓÐÓù¦Ò»¶¨Ê±£¬¶îÍ⹦ԽÉÙ£¬ÓÐÓù¦ÔÚ×ܹ¦ÖÐËùÕ¼µÄ±ÈÀý¾ÍÔ½´ó£¬»úеЧÂʾÍÔ½¸ß£®
¹Ê´ð°¸Îª£º£¨1£©¸ß£»£¨2£©0.4£»72.7%£»£¨3£©Ôö´ó£»£¨4£©Ôö´ó£»¼õС£®

µãÆÀ ±¾Ì⿼²éÁË̽¾¿Ó°Ï컬ÂÖ×é»úеЧÂÊÒòËصÄʵÑ飬Ҫ֪µÀÎïÌåÔ½ÖØ£¬×öµÄÓÐÓù¦Ô½¶à£¬»úеЧÂÊÔ½¸ß£»¶¯»¬ÂÖÔ½¶à£¬Ëù×öµÄ¶îÍ⹦Խ¶à£¬»¬ÂÖ×éµÄ»úеЧÂÊÔ½µÍ£®