Question

11£®ÈçͼËùʾ£¬¡åµç¶¯ºù«¡åÊǽ¨Öþ¹¤µØÉÏÆÕ±éʹÓõÄÆðÖØÉ豸£¬Ëüͨ¹ýµç¶¯»úºÍÒ»¸ö¶¯»¬ÂÖÌáÉýÖØÎÈô¡åµç¶¯ºù«¡åÔÚ10sÄÚ½«ÖÐ9800NµÄ¸Ö²ÄÔÈËÙµõÆð1m¸ß£¬¸ÖÉþµÄÀ­Á¦Îª5000N£¬²»¼ÆĦ²ÁºÍ¸ÖË¿ÉþµÄÉþÖØ£®Ôڴ˹ý³ÌÖУ¬Çó£º
£¨1£©¿Ë·þ¸Ö²ÄËùÊÜÖØÁ¦Ëù×öµÄ¹¦ÊÇÓÐÓù¦£¨Ñ¡Ìî¡åÓÐÓù¦¡å¡å¶îÍ⹦¡å»ò¡å×ܹ¦¡å£©£¬Æä´óСΪ¶àÉÙ½¹£»
£¨2£©µç¶¯»úµõÆð¸Ö²Ä¹ý³ÌÖУ¬À­Á¦×ö¹¦µÄ´óС¼°Æ书ÂÊ£»
£¨3£©¸Ã×°ÖõõÆðÕâÅú¸Ö²ÄʱµÄ»úеЧÂÊ£»
£¨4£©¶¯»¬ÂÖËùÊÜÖØÁ¦£®

Answer 1

·ÖÎö £¨1£©ÓÐÓù¦ÊÇÖ¸¶ÔÈËÃÇÓÐÓõŦ£»±¾ÌâÖÐΪ¿Ë·þ¸Ö²ÄÖØÁ¦×ö¹¦£¬ÀûÓÃW=Gh¼ÆË㣻
£¨2£©ÓÐÁ½¹ÉÉþµõ×ÅÎïÌ壬ÎïÌåÉÏÉýh£¬ÉþË÷×ÔÓɶËÒƶ¯2h£¬ËùÒÔÀ­Á¦×ö¹¦W_×Ü=Fs=F¡Á3h£»ÔÙÀûÓù¦Âʹ«Ê½P=$\frac{{W}_{×Ü}}{t}$¼´¿ÉÇóµÃÀ­Á¦µÄ¹¦ÂÊ£®
£¨3£©ÔËÓûúеЧÂʹ«Ê½´úÈëÊý¾Ý¼´¿ÉÇó³ö»úеЧÂÊ£»
£¨4£©ÀûÓÃF=$\frac{1}{n}$£¨G+G_¶¯£©Ç󶯻¬ÂÖÖØ£®

½â´ð ½â£º£¨1£©Ä¿µÄÊǰѸֲÄÌáÉýµ½Ò»¶¨¸ß¶È£¬Ëù¿Ë·þ¸Ö²ÄµÄÖØÁ¦×öµÄ¹¦ÊÇÓÐÓù¦£»
ÓÐÓù¦£ºW_ÓÐ=Gh=9800N¡Á1m=9800J£»
£¨2£©À­Á¦×ö¹¦£ºW_×Ü=Fs=F¡Á2h=5¡Á10³N¡Á1m¡Á2=1¡Á10⁴J£¬
À­Á¦µÄ¹¦ÂÊ£ºP=$\frac{{W}_{×Ü}}{t}$=$\frac{1¡Á1{0}^{4}J}{10s}$=1¡Á10³W£»
£¨3£©¦Ç=$\frac{{W}_{ÓÐ}}{{W}_{×Ü}}$¡Á100%=$\frac{9800J}{1¡Á1{0}^{4}J}$¡Á100%=98%£»
£¨4£©²»¼ÆÒ»ÇÐĦ²ÁºÍÉþÖØ£¬ËùÒÔF=$\frac{1}{n}$£¨G+G_¶¯£©£¬
ËùÒÔ¶¯»¬ÂÖÖØ£ºG_¶¯=2F-G_Îï=2¡Á5¡Á10³N-9800N=200N£¬
´ð£º£¨1£©ÓÐÓù¦£»ÓÐÓù¦Îª9800J£»
£¨2£©µç¶¯»úµõÆð¸Ö²Ä¹ý³ÌÖУ¬À­Á¦×ö¹¦1¡Á10³W£»Æ书ÂÊΪ1¡Á10³W£»
£¨3£©¸Ã»¬ÂÖ×éµÄ»úеЧÂÊΪ95%£»
£¨4£©¸Ã»¬ÂÖ×éµÄ¶¯»¬ÂÖÖØΪ300N£®

µãÆÀ ½â¾ö´ËÀà×ÛºÏÌâÄ¿µÄ¹Ø¼üÊÇÊìÁ·ÕÆÎÕ¹¦¡¢»¬ÂÖ×é¡¢»úеЧÂʵÄÓйØ֪ʶ£¬²¢Äܸù¾ÝÌâÄ¿Áé»îÔËÓã®