| Ô˶¯¹ý³Ì | Ô˶¯Ê±¼ä | Ô˶¯×´Ì¬ |
| ÔȼÓËÙÔ˶¯ | 0¡«40s | ³õËÙ¶Èv0=0£»Ä©ËÙ¶Èv=4.2m/s |
| ÔÈËÙÔ˶¯ | 40s¡«640s | v=4.2m/s |
| ÔȼõËÙÔ˶¯ | 640s¡«720s | ¿¿°¶Ê±v1=0.2m/s |
·ÖÎö £¨1£©¸ù¾Ý¼ÓËٶȵ͍Òåʽa=$\frac{¡÷v}{¡÷t}$Çó³öÓδ¬ÔȼÓËÙÔ˶¯¹ý³ÌÖмÓËÙ¶È£»¸ù¾ÝÎ»ÒÆµÈÓÚÆ½¾ùËٶȳËÒÔʱ¼äÇóÎ»ÒÆ£»
£¨2£©¸ù¾Ý¼ÓËٶȵ͍Òåʽa¨T$\frac{¡÷v}{¡÷t}$Çó³öÓδ¬ÔȼõËÙÔ˶¯¹ý³ÌÖмÓËÙ¶È´óС£¬ÔÙ¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇóºÏÁ¦´óСF£»
£¨3£©ÔËÓÃÎ»ÒÆ¹«Ê½Çó³öÓδ¬ÔÚÕû¸öÐÐÊ»¹ý³ÌÖеÄ×ÜÎ»ÒÆ£¬ÔÙÓÉÎ»ÒÆÓëʱ¼äÖ®±ÈÇó³öƽ¾ùËÙ¶È´óС£®
½â´ð ½â£º£¨1£©Óδ¬ÔȼÓËÙÔ˶¯¹ý³ÌÖмÓËÙ¶È´óС£º
a1=$\frac{¡÷{v}_{1}}{¡÷{t}_{1}}$=$\frac{4.2m/s}{40s}$=0.105m/s2£®
Óδ¬ÔȼÓËÙÔ˶¯¹ý³ÌÖÐÎ»ÒÆ´óС£º
x1=$\frac{v}{2}$¡÷t1=$\frac{4.2m/s}{2}$¡Á40s=84m£®
£¨2£©Óδ¬ÔȼõËÙÔ˶¯¹ý³ÌÖмÓËÙ¶È´óС£º
a2=$\frac{¡÷{v}_{3}}{¡÷{t}_{3}}$=$\frac{4.2m/s-0.2m/s}{720s-640s}$=0.05m/s2£¬
¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɿɵúÏÁ¦´óС£º
F=Ma2=8000kg¡Á0.05m/s2=400N£®
£¨3£©Óδ¬ÔÚÕû¸öÐÐÊ»¹ý³ÌÖеÄ×ÜÎ»ÒÆ£º
x=x1+v¡÷t2+$\frac{v+{v}_{1}}{2}$¡÷t3
=84m+4.2m/s¡Á600s+$\frac{4.2m/s+0.2m/s}{2}$¡Á80s
=2780m£¬
ÔòÓδ¬ÔÚÕû¸öÐÐÊ»¹ý³ÌÖÐµÄÆ½¾ùËÙ¶È´óС£º
$\overline{v}$=$\frac{x}{{t}_{×Ü}}$=$\frac{2780m}{720s}$¡Ö3.86m/s£®
´ð£º£¨1£©Óδ¬ÔȼÓËÙÔ˶¯¹ý³ÌÖмÓËÙ¶È´óСa1ÊÇ0.105m/s2£»Î»ÒÆ´óСx1ÊÇ84m£»
£¨2£©Óδ¬ÔȼõËÙÔ˶¯¹ý³ÌÖÐËùÊܵĺÏÁ¦´óСFÊÇ400N£»
£¨3£©Óδ¬ÔÚÕû¸öÐÐÊ»¹ý³ÌÖÐµÄÆ½¾ùËÙ¶È´óСÊÇ3.86m/s£®
µãÆÀ ½â´ð±¾ÌâµÄ¹Ø¼üÊÇÀíÇåÓ䬵ÄÔ˶¯Çé¿ö£¬ÔËÓÃÔ˶¯Ñ§¹«Ê½ºÍÅ£¶ÙµÚ¶þ¶¨Âɽâ¾ö¶¯Á¦Ñ§ÎÊÌ⣬Ҳ¿ÉÒÔ»³öv-tͼÏóÀ´·ÖÎöÓ䬵ÄÔ˶¯Çé¿ö£®
| Äê¼¶ | ¸ßÖÐ¿Î³Ì | Äê¼¶ | ³õÖÐ¿Î³Ì |
| ¸ßÒ» | ¸ßÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÒ» | ³õÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ß¶þ | ¸ß¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õ¶þ | ³õ¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ßÈý | ¸ßÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÈý | ³õÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
| A£® | ÒºÌåºÜÄѱ»Ñ¹Ëõ£¬ËµÃ÷·Ö×Ó¼äÓÐÒýÁ¦ | |
| B£® | ¹ÌÌåÖзÖ×ÓÅÅÁнϽôÃÜ£¬ËµÃ÷·Ö×Ó¼äÖ»ÓÐÒýÁ¦£¬Ã»ÓгâÁ¦ | |
| C£® | ÆÆ¾µÄÑÔ²£¬ËµÃ÷·Ö×Ó¼äûÓÐ×÷ÓÃÁ¦ | |
| D£® | ÓøÉÊÖÆ÷´µ³öµÄÈÈ·ç´µ¸ÕÏ´¹ýµÄÊÖ£¬¿ÉÒÔ¼Ó¿ìÊÖÉÏË®µÄÕô·¢ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£º×÷ͼÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
| A£® | Ö²Ê÷ÖУ¬°ÑÍÁÑïÆðÀ´µÄÌúÇÂÊôÓÚÊ¡Á¦¸Ü¸Ë | |
| B£® | ÑïÆðÀ´µÄÍÁ×îÖÕÒªÂäÏòµØÃæÊÇÒòΪÊܵ½ÖØÁ¦µÄ×÷Óà | |
| C£® | ÀͶ¯Öгöº¹µÄÍ·¶¥¾·çÒ»´µ¸Ð¾õÁ¹Ë¬£¬ÕâÊǺ¹ÒºÕô·¢ÎüÈȵÄÔµ¹Ê | |
| D£® | ÈËÃÇÄÜÎŵ½¸½½üÒ»¿ÃÔ翪»¨µÄÌÒÊ÷µÄ»¨Ï㣬ÕâÊÇÀ©É¢ÏÖÏó |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
| A£® | Òª»ñµÃ3×éʵÑéÊý¾Ý£¬µçѹԤÉèÖµ·¶Î§¿ÉÒÔΪ1.5V-5V | |
| B£® | Òª»ñµÃ3×éʵÑéÊý¾Ý£¬µçѹԤÉèÖµ·¶Î§¿ÉÒÔΪ1V-4V | |
| C£® | µçѹԤÉèÖµÔ½´ó£¬ÔÚ»ñµÃ3×éʵÑéÊý¾Ý¹ý³ÌÖУ¬»¬¶¯±ä×èÆ÷×èÖµµ÷½Ú·¶Î§Ô½Ð¡ | |
| D£® | ʵÑéµçѹԤÉèֵΪ2V£®Òª»ñµÃ3×éʵÑéÊý¾Ý£¬Òª¸ü»»×î´ó×èֵΪ30¦¸µÄ»¬¶¯±ä×èÆ÷ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¹ú¼ÊѧУÓÅÑ¡ - Á·Ï°²áÁбí - ÊÔÌâÁбí
ºþ±±Ê¡»¥ÁªÍøÎ¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨Æ½Ì¨ | ÍøÉÏÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | µçÐÅթƾٱ¨×¨Çø | ÉæÀúÊ·ÐéÎÞÖ÷ÒåÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | ÉæÆóÇÖȨ¾Ù±¨×¨Çø
Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com