ÌâÄ¿ÄÚÈÝ
Èçͼ¼×Ëùʾ£¬Ò»×ã¹»³¤×èÖµ²»¼ÆµÄ¹â»¬Æ½ÐнðÊôµ¼¹ìMN¡¢PQÖ®¼äµÄ¾àÀëL=1.0m£¬NQÁ½¶ËÁ¬½Ó×èÖµR=3.0¦¸µÄµç×裬´Å¸ÐӦǿ¶ÈΪBµÄÔÈÇ¿´Å³¡´¹Ö±ÓÚµ¼¹ìËùÔÚƽÃæÏòÉÏ£¬µ¼¹ìƽÃæÓëˮƽÃæ¼äµÄ¼Ð½Ç¦È=300£®Ò»ÖÊÁ¿m=0.20kg£¬×èÖµr=0.50¦¸µÄ½ðÊô°ô´¹Ö±ÓÚµ¼¹ì·ÅÖò¢ÓþøԵϸÏßͨ¹ý¹â»¬µÄ¶¨»¬ÂÖÓëÖÊÁ¿M=0.60kgµÄÖØÎïÏàÁ¬£®Ï¸ÏßÓë½ðÊôµ¼¹ìƽÐУ®½ðÊô°ôÑص¼¹ìÏòÉÏ»¬ÐеÄËÙ¶ÈvÓëʱ¼ätÖ®¼äµÄ¹ØϵÈçͼÒÒËùʾ£¬ÒÑÖª½ðÊô°ôÔÚ0¡«0.3sÄÚͨ¹ýµÄµçÁ¿ÊÇ0.3¡«0.6sÄÚͨ¹ýµçÁ¿µÄ
£¬g=10m/s2£¬Çó£º
£¨1£©0¡«0.3sÄÚ°ôͨ¹ýµÄλÒÆ£»
£¨2£©½ðÊô°ôÔÚ0¡«0.6sÄÚ²úÉúµÄÈÈÁ¿£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061022274429635997.png)
1 |
3 |
£¨1£©0¡«0.3sÄÚ°ôͨ¹ýµÄλÒÆ£»
£¨2£©½ðÊô°ôÔÚ0¡«0.6sÄÚ²úÉúµÄÈÈÁ¿£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061022274429635997.png)
£¨1£©½ðÊô°ôÔÚ0.3¡«0.6sÄÚͨ¹ýµÄµçÁ¿ÊÇq1=I1t1=
BLvt1 |
R+r |
½ðÊô°ôÔÚ0¡«0.3sÄÚͨ¹ýµÄµçÁ¿q2=
¡÷¦µ |
R+r |
BLx2 |
R+r |
ÓÉÌ⣺q1=3q2£¬
´úÈë½âµÃ£ºx2=0.35m
£¨2£©½ðÊô°ôÔÚ0¡«0.6sÄÚͨ¹ýµÄ×ÜλÒÆΪx=x1+x2=vt1+x2£¬´úÈë½âµÃx=1.4m
¸ù¾ÝÄÜÁ¿Êغ㶨ÂÉ
Mgx-mgxsin¦È-Q=
1 |
2 |
´úÈë½âµÃ Q=2.1J
ÓÉÓÚ½ðÊô°ôÓëµç×èR´®Áª£¬µçÁ÷ÏàµÈ£¬¸ù¾Ý½¹¶ú¶¨ÂÉQ=I2Rt£¬µÃµ½ËüÃDzúÉúµÄÈÈÁ¿Óëµç×è³ÉÕý±È£¬ËùÒÔ½ðÊô°ôÔÚ0¡«0.6sÄÚ²úÉúµÄÈÈÁ¿Á¿Qr=
r |
r+R |
´ð£º£¨1£©0¡«0.3sÄÚ°ôͨ¹ýµÄλÒÆΪ0.35m£»
£¨2£©½ðÊô°ôÔÚ0¡«0.6sÄÚ²úÉúµÄÈÈÁ¿Îª0.3J£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿