ÌâÄ¿ÄÚÈÝ
5£®2014Äê´ºÍíÖпªÐÄÂ黨ÍŶӴòÔìµÄ´´ÒâÐÎÌåÐ㡶ħ»ÃÈýÐֵܡ·¸ø¹ÛÖÚÁôÏÂÁ˺ÜÉîµÄÓ¡Ï󣮸þç²ÉÓÃÁË¡°Ð±ÌÉ¡±µÄ±íÑÝ·½Ê½£¬ÈýλÑÝÔ±ÌÉÔÚÇã½ÇΪ30¡ãµÄбÃæÉÏÍê³ÉһϵÁж¯×÷£¬ÉãÏñ»ú´¹Ö±ÓÚбÃæÅÄÉ㣬ÈùÛÖÚ²úÉúÑÝÔ±ÔÚÊúֱǽÃæÇ°±íÑݵĴí¾õ£®ÈçͼËùʾ£¬ÑÝÔ±¼×±»ÑÝÔ±ÒÒºÍÑÝÔ±±û¡°ÊúÖ±ÏòÉÏ¡±Å׳ö£¬µ½×î¸ßµãºóÇ¡ºÃÐüÍ£ÔÚ¡°¿ÕÖС±£®ÒÑÖªÑÝÔ±¼×µÄÖÊÁ¿m=60kg£¬¸Ã¹ý³ÌÖйÛÖÚ¿´µ½ÑÝÔ±¼×ÉÏÉýµÄ¡°¸ß¶È¡±Îª0.8m£®ÉèÑÝÔ±¼×ºÍбÃæ¼ä×î´ó¾²Ä¦²ÁÁ¦µÈÓÚ»¬¶¯Ä¦²ÁÁ¦£¬ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£¬²»¼Æ¿ÕÆø×èÁ¦£®Ôò¸Ã¹ý³ÌÖУ¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©A£® | ÑÝÔ±¼×±»Å׳öµÄ³õËÙ¶ÈΪ4m/s | B£® | ÑÝÔ±¼×Ô˶¯µÄʱ¼äΪ0.8s | ||
C£® | ÑÝÔ±ÒÒºÍÑÝÔ±±û¶Ô¼××öµÄ¹¦Îª480J | D£® | ÑÝÔ±¼×µÄÖØÁ¦ÊÆÄÜÔö¼ÓÁË480J |
·ÖÎö ¸ù¾Ý×î¸ßµãÄܹ»ÐüÍ£µÃ³öÖØÁ¦ÑØбÃæ·½ÏòµÄ·ÖÁ¦ºÍĦ²ÁÁ¦µÄ¹Øϵ£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɵóöÑÝÔ±ÉÏ»¬µÄ¼ÓËٶȣ¬½áºÏËÙ¶ÈλÒƹ«Ê½Çó³öÑÝÔ±¼×µÄ³õËٶȣ¬½áºÏËÙ¶Èʱ¼ä¹«Ê½Çó³öÑÝÔ±¼×µÄÔ˶¯Ê±¼ä£®¸ù¾ÝÉÏÉýµÄ¸ß¶ÈÇó³öÑÝÔ±¼×µÄÖØÁ¦ÊÆÄܵÄÔö¼ÓÁ¿£®¸ù¾Ý¶¯Äܶ¨ÀíÇó³öÑÝÔ±ÒÒºÍÑÝÔ±±û¶Ô¼××ö¹¦µÄ´óС£®
½â´ð ½â£ºA¡¢ÒòΪµ½´ï×î¸ßµãºó£¬Ç¡ºÃÐüÍ££¬ÔòÓУºmgsin30¡ã=¦Ìmgcos30¡ã£¬ÏòÉÏ»¬¶¯µÄ¹ý³ÌÖУ¬¼ÓËÙ¶Èa=$\frac{mgsin30¡ã+¦Ìmgcos30¡ã}{m}=2gsin30¡ã=10m/{s}^{2}$£®
¸ù¾Ý${{v}_{0}}^{2}=2ax$µÃ£¬³õËÙ¶È${v}_{0}=\sqrt{2ax}=\sqrt{2¡Á10¡Á0.8}$=4m/s£®¹ÊAÕýÈ·£®
B¡¢ÑÝÔ±¼×µÄÔ˶¯Ê±¼ät=$\frac{{v}_{0}}{a}=\frac{4}{10}s=0.4s$£®¹ÊB´íÎó£®
C¡¢ÑÝÔ±ÒÒºÍÑÝÔ±±û¶Ô¼××öµÄ¹¦W=$\frac{1}{2}m{{v}_{0}}^{2}=\frac{1}{2}¡Á60¡Á16J=480J$£®¹ÊCÕýÈ·£®
D¡¢ÑÝÔ±¼×µÄÖØÁ¦ÊÆÄÜÔö¼ÓÁ¿$¡÷{E}_{p}=mgxsin30¡ã=600¡Á0.8¡Á\frac{1}{2}$J=240J£®¹ÊD´íÎó£®
¹ÊÑ¡£ºAC£®
µãÆÀ ±¾Ì⿼²éÁËÅ£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½µÄ×ÛºÏÔËÓã¬ÖªµÀ¼ÓËÙ¶ÈÊÇÁªÏµÁ¦Ñ§ºÍÔ˶¯Ñ§µÄÇÅÁº£¬ÒÔ¼°ÖªµÀÖØÁ¦×ö¹¦ÓëÖØÁ¦ÊÆÄܵĹØϵ£®
A£® | Á÷¹ý¶¨Öµµç×èR3µÄµçÁ÷´óСΪ0.5A£¬·½Ïò´ÓÉÏÏòÏ | |
B£® | Á÷¹ý¶¨Öµµç×èR3µÄµçÁ÷´óСΪ0.5A£¬·½Ïò´ÓÏÂÏòÉÏ | |
C£® | µçÁ÷±íµÄʾÊýΪ0.5A£¬·½ÏòÏòÓÒ | |
D£® | µçÁ÷±íµÄʾÊýΪ1.5A£¬·½ÏòÏòÓÒ |
A£® | AµãµÄµç³¡Ç¿¶È´óÓÚBµãµÄµç³¡Ç¿¶È | |
B£® | AµãµÄµçÊƵÈÓÚCµãµÄµçÊÆ | |
C£® | ½«ÕýµçºÉ´ÓAµãÒƵ½Bµã£¬µç³¡Á¦×öÕý¹¦ | |
D£® | ½«¸ºµçºÉ´ÓBµãÒƵ½Cµã£¬µç³¡Á¦×öÕý¹¦ |