Question

6£®ÈçͼËùʾ£¬Á½ÊúÖ±ÇÒÕý¶Ô·ÅÖõĵ¼ÈÈÆø¸×µ×²¿ÓÉϸ¹ÜµÀ£¨Ìå»ýºöÂÔ²»¼Æ£©Á¬Í¨£¬Á½»îÈûa¡¢bÓøÕÐԸܸËÏàÁ¬£¬¿ÉÔÚÁ½Æø¸×ÄÚÎÞĦ²ÁµØÒƶ¯£®ÉÏÏÂÁ½»îÈû£¨ºñ¶È²»¼Æ£©µÄºá½ØÃæ»ý·Ö±ðΪS₁=10cm²¡¢S₂=20cm²£¬Á½»îÈû×ÜÖÊÁ¿ÎªM=5kg£¬Á½Æø¸×¸ß¶È¾ùΪH=10cm£®Æø¸×ÄÚ·âÓÐÒ»¶¨ÖÊÁ¿µÄÀíÏëÆøÌ壬ϵͳƽºâʱ»îÈûa¡¢bµ½Æø¸×µ×µÄ¾àÀë¾ùΪL=5cm£¨Í¼ÖÐδ±ê³ö£©£¬ÒÑÖª´óÆøѹǿΪp₀=1.0¡Á10⁵Pa£¬»·¾³Î¶ÈΪT₀=300K£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡10m/s²£®Çó£º
£¨1£©Èô»ºÂýÉý¸ß»·¾³Î¶ȣ¬Ê¹»îÈû»ºÂýÒƵ½Ò»²àÆø¸×µÄµ×²¿£¬Çó´Ëʱ»·¾³Î¶ȣ»
£¨2£©Èô±£³ÖζȲ»±ä£¬ÓÃÊúÖ±ÏòϵÄÁ¦»ºÂýÍÆ»îÈûb£¬ÔÚ»îÈûbÓÉ¿ªÊ¼Ô˶¯µ½Æø¸×µ×²¿¹ý³ÌÖУ¬ÇóÏòÏÂÍÆÁ¦µÄ×î´óÖµ£®

Answer 1

·ÖÎö £¨1£©Æø¸×ÄÚµÄÆøÌå·¢ÉúµÈѹ±ä»¯£¬¸ù¾Ý¸Ç-ÂÀÈø¿Ë¶¨Âɼ´¿ÉÇó½â£»
£¨2£©¸ù¾ÝƽºâÌõ¼þÇó³ö³õʼʱ·â±ÕÆøÌåµÄѹǿ£¬Óɲ£Òâ¶ú¶¨ÂÉÇó³öĩ̬ÆøÌåµÄѹǿ£¬ÔÙ¸ù¾ÝƽºâÌõ¼þÇó³öÏòϵÄÍÆÁ¦µÄ×î´óÖµ£»

½â´ð ½â£º£¨1£©Æø¸×ÄÚÆøÌåѹǿ²»±ä£¬Î¶ÈÉý¸ß£¬ÆøÌåÌå»ý±ä´ó£¬¹Ê»îÈûÏòÉÏÒƶ¯£¬ÓɸÇ-ÂÀÈø¿Ë¶¨Âɵãº
$\frac{l{S}_{1}^{\;}+l{S}_{2}^{\;}}{{T}_{0}^{\;}}=\frac{H{S}_{2}^{\;}}{T}$
´úÈëÊý¾ÝµÃ£ºT=400K
£¨2£©Éè³õʼÆøÌåѹǿΪ${p}_{1}^{\;}$£¬ÓÉƽºâÌõ¼þÓУº
${p}_{0}^{\;}{S}_{1}^{\;}$+${p}_{1}^{\;}{S}_{2}^{\;}=Mg+{p}_{0}^{\;}{S}_{2}^{\;}+{p}_{1}^{\;}{S}_{1}^{\;}$
´úÈëÊý¾ÝµÃ£º${p}_{1}^{\;}=1.5¡Á1{0}_{\;}^{5}{p}_{a}^{\;}$
»îÈûb¸ÕÒªµ½´ïÆû¸×µ×²¿Ê±£¬ÏòϵÄÍÆÁ¦×î´ó£¬´ËʱÆøÌåµÄÌå»ýΪ$H{S}_{1}^{\;}$£¬Ñ¹Ç¿Îª${p}_{2}^{\;}$
Óɲ£Òâ¶ú¶¨ÂÉÓУº${p}_{1}^{\;}£¨l{S}_{1}^{\;}+l{S}_{2}^{\;}£©={p}_{2}^{\;}H{S}_{1}^{\;}$
´úÈëÊý¾ÝµÃ£º${p}_{2}^{\;}=2.25¡Á1{0}_{\;}^{5}{p}_{a}^{\;}$
ÓÉƽºâÌõ¼þÓУº${p}_{0}^{\;}{S}_{1}^{\;}+{p}_{2}^{\;}{S}_{2}^{\;}=Mg+{p}_{0}^{\;}{S}_{2}^{\;}+{p}_{2}^{\;}{S}_{1}^{\;}+F$
´úÈëÊý¾ÝµÃ£ºF=75N
´ð£º£¨1£©Èô»ºÂýÉý¸ß»·¾³Î¶ȣ¬Ê¹»îÈû»ºÂýÒƵ½Ò»²àÆø¸×µÄµ×²¿£¬´Ëʱ»·¾³Î¶ÈΪ400K£»
£¨2£©Èô±£³ÖζȲ»±ä£¬ÓÃÊúÖ±ÏòϵÄÁ¦»ºÂýÍÆ»îÈûb£¬ÔÚ»îÈûbÓÉ¿ªÊ¼Ô˶¯µ½Æø¸×µ×²¿¹ý³ÌÖУ¬ÏòÏÂÍÆÁ¦µÄ×î´óֵΪ75N

µãÆÀ ±¾ÌâµÄ¹Ø¼üÊÇÀûÓûîÈûÊÜÁ¦Æ½ºâµÄÌõ¼þÇó·â±ÕÆøÌåµÄѹǿ£¬ÖªµÀ»îÈûÉÏϵÄÆøÌåѹǿÏàµÈºÜ¹Ø¼ü£¬ÊÇÒ»µÀ±È½ÏÀ§ÄѵÄÒ×´íÌ⣮