ÈçͼËùʾ£¬·½ÐÎľÏäÖÊÁ¿ÎªM£¬ÆäÄÚÓÃÁ½ÇáÉþ½«Ò»ÖÊÁ¿m=0.1kgµÄСÇòÐü¹ÒÓÚP¡¢QÁ½µã£¬Á½Ï¸ÉþÓëˮƽµÄ³µ¶¥ÃæµÄ¼Ð½ÇΪ60¡ãºÍ30¡ã£®Ë®Æ½´«ËÍ´øAB³¤l=30m£¬ÒÔv=15m/sµÄËÙ¶È˳ʱÕëת¶¯£¬Ä¾ÏäÓë´«ËÍ´ø¼ä¶¯Ä¦²ÁÒòÊý¦Ì=0.75£¬£¨g=10m/s2£©Çó£º
£¨1£©ÉèľÏäΪÖʵ㣬ÇÒľÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬ÄÇô¾­¹ý¶à³¤Ê±¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»
£¨2£©Ä¾Ïä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ¶àÉÙ£¿

½â£º£¨1£©Ä¾ÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬¿ªÊ¼¹ý³Ì£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɵÃ
¶ÔľÏ䣺¦ÌMg=Ma a=7.5m/s2
ľÏä¼ÓËÙλÒÆ£ºx1=15m
ľÏä¼ÓËÙʱ¼ä£º
x1=15m£¼l=30m ËùÒÔ»¹ÒªÔÚ´«ËÍ´øÉÏÔÈËÙºóÒ»¶Î¾àÀë
ľÏäÔÈËÙʱÔ˶¯µÄʱ¼ä£ºl-x1=vt2 t2=1s
ËùÒÔľÏä´ÓAÔ˶¯µ½´«ËÍ´øÁíÒ»¶ËB´¦¾­Àúʱ¼ät=t1+t2=3s
£¨2£©ÉèÉþPÉìֱǡºÃÎÞÀ­Á¦Ê±Ä¾ÏäµÄ¼ÓËÙ¶ÈΪa0£¬ÔòÓÉÅ£¶ÙµÚ¶þ¶¨ÂɵÃ
mgtan30¡ã=ma0
´úÈë½âµÃ
ľÏä¼ÓËÙʱa=7.5m/s2£¾
ËùÒÔСÇòÒѾ­¡ã¹ÊÉþPµÄÕÅÁ¦´óСTP=0
´Ëʱ£º=ma
´úÈë½âµÃTQ=1.25N
´ð£º£¨1£©Ä¾ÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬¾­¹ý3sʱ¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»
£¨2£©Ä¾Ïä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ0ºÍ1.25N£®
·ÖÎö£º£¨1£©Ä¾ÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬Ë®Æ½·½ÏòÏÈ×öÊܵ½»¬¶¯Ä¦²ÁÁ¦£¬×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö¼ÓËٶȣ¬ÓÉËٶȹ«Ê½Çó³öľÏäËÙ¶ÈÓë´«ËÍ´øÏàͬʱ¾­ÀúµÄʱ¼äºÍͨ¹ýµÄλÒÆ£¬²¢ÅжÏľÏäÊÇ·ñÓÐÔÈËÙÔ˶¯¹ý³Ì£®ÈçÓУ¬Çó³öʱ¼ä£¬ÔÙÇó×Üʱ¼ä£®
£¨2£©ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³öÉþPÇ¡ºÃÕÅÁ¦Ê±Ä¾ÏäµÄ¼ÓËÙ¶Èa0£¬¸ù¾Ýa0ÓëľÏä¼ÓËÙ¹ý³ÌµÄ¼ÓËÙ¶ÈaµÄ´óС±È½Ï£¬ÅжÏÉþPÊÇ·ñÓÐÕÅÁ¦£¬ÔÙÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÇó½âÁ½ÉþµÄÕÅÁ¦£®
µãÆÀ£º±¾ÌâÊÇ´«ËÍ´øÎÊÌ⣬¹Ø¼ü´æÔÚÎïÌå·ÅÉÏ´«ËÍ´øºóÔ˶¯Çé¿ö£¬ÍùÍùͨ¹ý¼ÆËã²ÅÄÜ·ÖÎöÎïÌåÓÐÎÞÔÈËÙÔ˶¯¹ý³Ì£®¶ÔÓÚµÚ£¨2£©ÎÊÊôÓÚÁÙ½çÎÊÌ⣬ҪÑо¿ÁÙ½ç¼ÓËٶȣ¬·ÖÎöÉþPÊÇ·ñËɳڣ®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÈçͼËùʾ£¬·½ÐÎľÏäÖÊÁ¿ÎªM£¬ÆäÄÚÓÃÁ½ÇáÉþ½«Ò»ÖÊÁ¿m=0.1kgµÄСÇòÐü¹ÒÓÚP¡¢QÁ½µã£¬Á½Ï¸ÉþÓëˮƽµÄ³µ¶¥ÃæµÄ¼Ð½ÇΪ60¡ãºÍ30¡ã£®Ë®Æ½´«ËÍ´øAB³¤l=30m£¬ÒÔv=15m/sµÄËÙ¶È˳ʱÕëת¶¯£¬Ä¾ÏäÓë´«ËÍ´ø¼ä¶¯Ä¦²ÁÒòÊý¦Ì=0.75£¬£¨g=10m/s2£©Çó£º
£¨1£©ÉèľÏäΪÖʵ㣬ÇÒľÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬ÄÇô¾­¹ý¶à³¤Ê±¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»
£¨2£©Ä¾Ïä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ¶àÉÙ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£ººÚÁú½­Ê¡¹þ¾ÅÖÐ2010£­2011ѧÄê¸ßÒ»ÉÏѧÆÚÆÚÄ©¿¼ÊÔÎïÀíÊÔÌâ ÌâÐÍ£º038

ÈçͼËùʾ£¬·½ÐÎľÏäÖÊÁ¿ÎªM£¬ÆäÄÚÓÃÁ½ÇáÉþ½«Ò»ÖÊÁ¿m£½0.1 kgµÄСÇòÐü¹ÒÓÚP¡¢QÁ½µã£¬Á½Ï¸ÉþÓëˮƽµÄ³µ¶¥ÃæµÄ¼Ð½ÇΪ60¡ãºÍ30¡ã£®Ë®Æ½´«ËÍ´øAB³¤l£½30 m£¬ÒÔv£½15 m/sµÄËÙ¶È˳ʱÕëת¶¯£¬Ä¾ÏäÓë´«ËÍ´ø¼ä¶¯Ä¦²ÁÒòÊý¦Ì£½0.75£¬(g£½10 m/s2)Çó£º

(1)ÉèľÏäΪÖʵ㣬ÇÒľÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬ÄÇô¾­¹ý¶à³¤Ê±¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»

(2)ľÏä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ¶àÉÙ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º0108 ÆÚÄ©Ìâ ÌâÐÍ£º¼ÆËãÌâ

ÈçͼËùʾ£¬·½ÐÎľÏäÖÊÁ¿ÎªM£¬ÆäÄÚÓÃÁ½ÇáÉþ½«Ò»ÖÊÁ¿m=0.1kgµÄСÇòÐü¹ÒÓÚP¡¢QÁ½µã£¬Á½Ï¸ÉþÓëˮƽµÄ³µ¶¥ÃæµÄ¼Ð½ÇΪ60¡ãºÍ30¡ã¡£Ë®Æ½´«ËÍ´øAB³¤l=30m£¬ÒÔv=15m/sµÄËÙ¶È˳ʱÕëת¶¯£¬Ä¾ÏäÓë´«ËÍ´ø¼ä¶¯Ä¦²ÁÒòÊý¦Ì=0.75£¬£¨g£½10 m/s2£©Çó£º
£¨1£©ÉèľÏäΪÖʵ㣬ÇÒľÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬ÄÇô¾­¹ý¶à³¤Ê±¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»
£¨2£©Ä¾Ïä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ¶àÉÙ?

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2010-2011ѧÄêºÚÁú½­Ê¡¹þ¶û±õ¾ÅÖиßÒ»£¨ÉÏ£©ÆÚÄ©ÎïÀíÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ÈçͼËùʾ£¬·½ÐÎľÏäÖÊÁ¿ÎªM£¬ÆäÄÚÓÃÁ½ÇáÉþ½«Ò»ÖÊÁ¿m=0.1kgµÄСÇòÐü¹ÒÓÚP¡¢QÁ½µã£¬Á½Ï¸ÉþÓëˮƽµÄ³µ¶¥ÃæµÄ¼Ð½ÇΪ60°ºÍ30°£®Ë®Æ½´«ËÍ´øAB³¤l=30m£¬ÒÔv=15m/sµÄËÙ¶È˳ʱÕëת¶¯£¬Ä¾ÏäÓë´«ËÍ´ø¼ä¶¯Ä¦²ÁÒòÊý¦Ì=0.75£¬£¨g=10m/s2£©Çó£º
£¨1£©ÉèľÏäΪÖʵ㣬ÇÒľÏäÓɾ²Ö¹·Åµ½´«ËÍ´øÉÏ£¬ÄÇô¾­¹ý¶à³¤Ê±¼äľÏäÄܹ»´ÓAÔ˶¯µ½´«ËÍ´øµÄÁíÒ»¶ËB´¦£»
£¨2£©Ä¾Ïä·Åµ½´«ËÍ´øAµãºó£¬ÔÚľÏä¼ÓËٵĹý³ÌÖУ¬ÉþPºÍÉþQµÄÕÅÁ¦´óС·Ö±ðΪ¶àÉÙ£¿

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸