16£®ÈçͼËùʾ£¬ÖÊÁ¿m=2kgµÄ½ðÊô¿é£¨¿ÉÊÓΪÖʵ㣩¾²Ö¹ÓÚˮƽƽ̨ÉϵÄAµã£¬½ðÊô¿éÓëƽ̨֮¼ä¶¯Ä¦²ÁÒòÊýΪ0.5£¬Æ½Ì¨¾àµØÃ棨δ»­³ö£©¸ß3.2m£¬Aµã¾àÀëƽ̨±ßÑØ11.25m£¬ÏÖÊ©¼ÓÒ»Óëˮƽ·½Ïò³É¦È=37¡ã½ÇбÏòÉÏ¡¢´óСΪF=20NµÄÀ­Á¦£¬×÷ÓÃÒ»¶Î¾àÀëºó³·È¥£¬½ðÊô¿é¼ÌÐøÔÚƽ̨ÉÏ»¬ÐоàÀëxºó·É³ö£¬ÂäµØËÙ¶ÈÓëÊúÖ±·½Ïò¼Ð½ÇΪ37¡ã£¨cos37¡ã=0.8£¬sin37¡ã=0.6£¬g=10m/s2£©Çó£º
£¨1£©½ðÊô¿é×öÔȼÓËÙÖ±ÏßÔ˶¯µÄ¼ÓËٶȴóСa1£»
£¨2£©½ðÊô¿é´Óƽ̨ÉϷɳöµÄËٶȴóСvx£»
£¨3£©ÇóÀ­Á¦F³·È¥ºóÔÚƽ̨ÉÏ»¬ÐоàÀëx2£®

·ÖÎö £¨1£©¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó½ðÊô¿éÔȼÓËÙÔ˶¯µÄ¼ÓËٶȣ»
£¨2£©½ðÊô¿éÀ뿪ƽ̨×öƽÅ×Ô˶¯£¬¸ù¾ÝÊúÖ±¸ß¶ÈÇó³öʱ¼ä¼°ÊúÖ±·ÖËٶȣ¬ÔÙ¸ù¾Ý¼¸ºÎ¹ØϵÇó³öˮƽ·ÖËٶȣ»
£¨3£©Çó³ö³·È¥FºóÔȼõËÙÔ˶¯µÄ¼ÓËٶȣ¬¶ÔÇ°ºóÁ½¸ö¹ý³ÌÔËÓÃËÙ¶ÈλÒƹ«Ê½ÁÐʽ¼´¿ÉÇó³öÀ­Á¦F³·È¥ºóÔÚƽ̨ÉÏ»¬ÐоàÀ룻

½â´ð ½â£º£¨1£©Éèƽ̨¶Ô½ðÊô¿éµÄÖ§³ÖÁ¦Îª${F}_{N}^{\;}$£¬½ðÊô¿é¶Ôƽ̨µÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì£¬ËùÒÔÓУº
$Fcos¦È-f=m{a}_{1}^{\;}$
$mg=Fsin¦È+{F}_{N}^{\;}$
$f=¦Ì{F}_{N}^{\;}$
½âµÃ£º${a}_{1}^{\;}=6m/{s}_{\;}^{2}$
£¨2£©¸ù¾ÝƽÅ×Ô˶¯µÄ·ÖÎö¿ÉµÃÊúÖ±·½ÏòÓУº$h=\frac{1}{2}g{t}_{\;}^{2}$
µÃ£º$t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2¡Á3.2}{10}}=0.8s$
${v}_{y}^{\;}=gt=10¡Á0.8=8m/s$
$tan37¡ã=\frac{{v}_{x}^{\;}}{{v}_{y}^{\;}}$=$\frac{{v}_{x}^{\;}}{8}$
½âµÃ£º${v}_{x}^{\;}=6m/s$
£¨3£©Éè³·È¥Fºó£¬Ô˶¯µÄ¼ÓËÙ¶ÈΪ${a}_{2}^{\;}$£¬
$¦Ìmg=m{a}_{2}^{\;}$£¬
¼´£º${a}_{2}^{\;}=¦Ìg$
½âµÃ£º${a}_{2}^{\;}=6m/{s}_{\;}^{2}$
ÉèÔÚƽ̨ÉÏ×î´óËÙ¶ÈΪv£¬
ÔȼÓËÙÖ±ÏßÔ˶¯¹ý³ÌλÒÆΪ${x}_{1}^{\;}$£¬ÓУº${x}_{1}^{\;}=\frac{{v}_{\;}^{2}}{2{a}_{1}^{\;}}$
³·È¥FºóÔȼõËÙÖ±ÏßÔ˶¯µÄλÒÆΪ${x}_{2}^{\;}$£¬ÓУº${x}_{2}^{\;}=\frac{{v}_{x}^{2}-{v}_{\;}^{2}}{-2{a}_{2}^{\;}}$
${x}_{1}^{\;}+{x}_{2}^{\;}=11.25$m
½âµÃ£º${x}_{2}^{\;}=4.5m$
´ð£º£¨1£©½ðÊô¿é×öÔȼÓËÙÖ±ÏßÔ˶¯µÄ¼ÓËٶȴóС${a}_{1}^{\;}$Ϊ$6m/{s}_{\;}^{2}$£»
£¨2£©½ðÊô¿é´Óƽ̨ÉϷɳöµÄËٶȴóС${v}_{x}^{\;}$Ϊ6m/s£»
£¨3£©ÇóÀ­Á¦F³·È¥ºóÔÚƽ̨ÉÏ»¬ÐоàÀë${x}_{2}^{\;}$Ϊ4.5m

µãÆÀ ±¾Ì⿼²é¶à¹ý³ÌÎÊÌ⣬¹Ø¼üÊÇÇå³þ¸÷¸ö¹ý³ÌµÄÔ˶¯Çé¿öºÍÊÜÁ¦Çé¿ö£¬ÖªµÀÇ°ºó¹ý³ÌµÄÏνӣ¬ÔËÓÃÅ£¶ÙÔ˶¯¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½Çó½â£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

19£®Ï¸ÏßµÄÒ»¶Ë¹Ì¶¨ÓÚÇã½ÇΪ45¡ãµÄ¹â»¬Ð¨Ðλ¬¿éAµÄ¶¥¶ËP´¦£¬Ï¸ÏßµÄÁíÒ»¶ËË©Ò»ÖÊÁ¿ÎªmµÄСÇò£¬»¬¿éÒÔ¼ÓËÙ¶ÈaÏò×ó¼ÓËÙÔ˶¯£®Çó£º
£¨1£©µ±aΪ¶à´óʱ£¬Ð¡Çò¶Ô»¬¿éµÄѹÁ¦µÈÓÚÁ㣮
£¨2£©µ±a=2gʱ£¬ÏßÖÐÀ­Á¦T1£®
£¨3£©µ±a=$\frac{g}{2}$ʱ£¬ÏßÖÐÀ­Á¦T2£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

20£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®²¼ÀÊÔ˶¯ÊÇÖ¸Ðü¸¡ÔÚÒºÌåÖеĹÌÌåС¿ÅÁ£µÄÎÞ¹æÔòÈÈÔ˶¯
B£®Ç峿ºÉÒ¶ÉϾ§Ó¨ÌÞ͸µÄ¶Öé³ÉÇòÐΣ¬ÊÇË®µÄ±íÃæÕÅÁ¦×÷ÓõĽá¹û
C£®Ò»¶¨ÖÊÁ¿µÄÀíÏëÆøÌå·¢ÉúµÈα仯ʱ£¬ÆäÄÚÄÜÒ»¶¨²»±ä
D£®ÏÄÌì´óÆøѹǿҪ±È¶¬ÌìµÄµÍ£¬ÁùÔÂÓëʮһÔÂÏà±È£¬µ¥Î»Ãæ»ýÉÏײ»÷µØÃæµÄ¿ÕÆø·Ö×Ó¸öÊýÒª¶à
E£®¸ÉʪÅÝʪ¶È¼ÆµÄʪÅÝÏÔʾµÄζȵÍÓÚ¸ÉÅÝÏÔʾµÄζȣ¬ÕâÊÇÓÉÓÚʪÅÝÍâÉ´²¼ÖеÄË®Õô·¢ÎüÈȵĽá¹û

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

4£®Èçͼ£¬ÖÊÁ¿m=10kgµÄÎï¿é¼×ÓëÖÊÁ¿ÎªM=4kg³¤Ä¾°å£¨×ã¹»³¤£©ÒÒÒ»ÆðÔÚÍâÁ¦FµÄ×÷ÓÃÏÂÏòÓÒ×öÔÈËÙÔ˶¯£¬ÒÑÖª¼×¡¢ÒÒÖ®¼ä¶¯Ä¦²ÁÒòÊý¦Ì1=0.1£¬µØÃæºÍ³¤Ä¾°åÖ®¼ä¶¯Ä¦²ÁÒòÊý¦Ì2=0.2£¬Ôò³·µôÁ¦Fºó£¨ÓÉÓÚľ°å×ã¹»³¤£¬¼×²»»áÍÑÀëľ°å£©£¬ÔòÏÂÁÐ˵·¨´íÎóµÄÊÇ£¨¡¡¡¡£©
A£®¼×ÒÒÈÔÈ»Ïà¶Ô¾²Ö¹£¬Ò»ÆðÔȼõËÙÔ˶¯Ö±ÖÁÍ£Ö¹
B£®ÔÚ¼×Í£Ö¹Ô˶¯Ç°£¬µØÃæ¶ÔÒÒµÄĦ²ÁÁ¦´óСʼÖÕ²»±ä
C£®ÔÚ¼×Í£Ö¹Ô˶¯Ç°£¬ÒҵļÓËÙ´óС¶¼ÊÇ4.5m/s2
D£®ÔÚÒÒÍ£Ö¹Ô˶¯Ç°£¬¼×µÄ¼ÓËٶȴóСʼÖÕΪ1m/s2

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

11£®Èçͼ£¬Ò»¿é×ã¹»³¤µÄdzɫ³¤Ä¾°å£¬¾²Ö¹µØ·ÅÖÃÔÚˮƽµØÃæÉÏ£®Ò»¸öú¿é¾²Ö¹ÔÚ¸Ãľ°åÉÏ£¬Ãº¿éÓëľ°å¼äµÄ»¬¶¯Ä¦²ÁϵÊýΪ¦Ì£®Í»È»£¬Ê¹Ä¾°åÒԺ㶨µÄËÙ¶Èv0×öÔÈËÙÖ±ÏßÔ˶¯£¬Ãº¿é½«ÔÚľ°åÉÏ»®ÏºÚÉ«ºÛ¼££®¾­¹ýijһʱ¼ät£¬Áîľ°åͻȻͣÏ£¬ÒÔºó²»ÔÙÔ˶¯£®ÒÑÖªÖØÁ¦¼ÓËÙ¶ÈΪg£¬Ãº¿é¿ÉÊÓΪÖʵ㣬²»¼Æú¿éÓëľ°åĦ²ÁÖÐËðʧµÄÖÊÁ¿£®ÔòÔÚ×îºóú¿é²»ÔÙÔ˶¯Ê±£¬Ä¾°åÉϳöÏֵĺÚÉ«ºÛ¼£µÄ³¤¶È¿ÉÄÜÊÇ£¨¡¡¡¡£©
A£®$\frac{v_0^2}{2¦Ìg}$B£®v0 tC£®v0t-$\frac{1}{2}$¦Ìgt2D£®$\frac{v_0^2}{¦Ìg}$

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

1£®ÖÊÁ¿¾ùΪMµÄÁ½Ä¾°å·ÅÔڹ⻬ˮƽÃæÉÏ£¬Á½Ä¾°åµÄÖеã¸÷·ÅÖÃÍêÈ«Ïàͬ¡¢ÖÊÁ¿¾ùΪmµÄÎï¿é£¬ÒÑÖªM£¾m£®ÏÖ´Ó¾²Ö¹¿ªÊ¼·Ö±ðÔÚÎï¿éºÍľ°åÉϸ÷×÷ÓÃˮƽºãÁ¦F1¡¢F2£¬Èçͼ¼×¡¢ÒÒËùʾ£®ÒÑÖªÎï¿éºÍľ°åÖ®¼äµÄ¶¯Ä¦²ÁÒòÊýÏàͬ£¬Á½Ä¾°å³¤¶ÈÒ²Ïàͬ£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®¼×ͼÖУ¬ÎÞÂÙF1µÄ´óСÈçºÎ£¬Ö»ÒªF1×÷ÓÃʱ¼ä×ã¹»³¤£¬ÔòÎï¿éºÍľ°å¾Í¿É·ÖÀë
B£®ÒÒͼÖУ¬Ö»ÓÐF2µÄ´óС´óÓÚijһֵʱ£¬²Å¿ÉÄÜʹÎï¿éºÍľ°å·ÖÀë
C£®Ê¹Îï¿éºÍľ°å·ÖÀëµÄ×îС×÷ÓÃÁ¦F1£¾F2
D£®Ê¹Îï¿éºÍľ°å·ÖÀëµÄ×îС×÷ÓÃÁ¦F1£¼F2

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

8£®ÈçͼËùʾ£¬Ò»Çã½Ç¦È=37¡ãµÄ×ã¹»³¤Ð±Ãæ¹Ì¶¨ÔÚˮƽµØÃæÉÏ£®µ±t=0ʱ£¬»¬¿éÒÔ³õËÙ¶Èv0=10m/sÑØбÃæÏòÉÏÔ˶¯£¬ÒÑÖª»¬¿éÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì=0.5£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡10m/s2£¬sin37¡ã=0.6£¬cos37¡ã=0.8£®ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®»¬¿éÒ»Ö±×öÔȱäËÙÖ±ÏßÔ˶¯
B£®t=1sʱ£¬»¬¿éËٶȼõΪÁ㣬Ȼºó¾²Ö¹ÔÚбÃæÉÏ
C£®t=2sʱ£¬»¬¿éÇ¡ºÃÓֻص½³ö·¢µã
D£®t=3sʱ£¬»¬¿éµÄËÙ¶ÈΪ4m/s

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º½â´ðÌâ

5£®2016Äêдº¼Ñ½Ú£¬ÎÒÊеÄÐí¶à²ÍÌüÉúÒâ»ð±¬£¬³£³£ÈËÂúΪ»¼£¬ÎªÄÜ·þÎñ¸ü¶àµÄ¹Ë¿Í£¬·þÎñÔ±ÐèÒªÓÃ×î¶ÌµÄʱ¼ä½«²ËëÈËÍÖÁ¹Ë¿Í´¦£¨Éè²ËÆ·Ë͵½¹Ë¿Í´¦ËÙ¶ÈÇ¡ºÃΪÁ㣩£®Ä³´Î·þÎñÔ±Óõ¥ÊÖÍÐÍÐÅÌ·½Ê½£¨Èçͼ£©¸ø12mÔ¶´¦µÄ¹Ë¿ÍÉϲˣ¬ÒªÇóÈ«³ÌÍÐÅÌˮƽ£®ÍÐÅ̺ÍÊÖ¡¢ÍëÖ®¼äµÄĦ²ÁÒòÊý·Ö±ðΪ0.2¡¢0.15£¬·þÎñÔ±ÉϲË×î´óËÙ¶ÈΪ3m/s£®¼ÙÉè·þÎñÔ±¼ÓËÙ¡¢¼õËÙÔ˶¯¹ý³ÌÖÐÊÇÔȱäËÙÖ±ÏßÔ˶¯£¬ÇÒ¿ÉÈÏΪ×î´ó¾²Ä¦²ÁÁ¦µÈÓÚ»¬¶¯Ä¦²ÁÁ¦£®Ôò£º
£¨1£©Çó·þÎñÔ±Ô˶¯µÄ×î´ó¼ÓËٶȣ»
£¨2£©·þÎñÔ±ÉϲËËùÓõÄ×î¶Ìʱ¼ä£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º¶àÑ¡Ìâ

6£®Èçͼ£¨¼×£©Ëùʾ£¬Æ½Ðй⻬½ðÊôµ¼¹ìˮƽ·ÅÖã¬Á½¹ìÏà¾àL=0.4m£¬µ¼¹ìÒ»¶ËÓë×èÖµR=0.3¦¸µÄµç×èÏàÁ¬£¬µ¼¹ìµç×è²»¼Æ£®µ¼¹ìx£¾0Ò»²à´æÔÚÑØx·½Ïò¾ùÔÈÔö´óµÄºã¶¨´Å³¡£¬Æä·½ÏòÓëµ¼¹ìƽÃæ´¹Ö±ÏòÏ£¬´Å¸ÐӦǿ¶ÈBËæλÖÃx±ä»¯Èçͼ£¨ÒÒ£©Ëùʾ£®Ò»¸ùÖÊÁ¿m=0.2kg¡¢µç×èr=0.1¦¸µÄ½ðÊô°ôÖÃÓÚµ¼¹ìÉÏ£¬²¢Óëµ¼¹ì´¹Ö±£¬°ôÔÚÍâÁ¦F×÷ÓÃÏ´Óx=0´¦ÒÔ³õËÙ¶Èv0=2m/sÑص¼¹ìÏòÓÒ±äËÙÔ˶¯£¬ÇÒ½ðÊô°ôÔÚÔ˶¯¹ý³ÌÖÐÊܵ½µÄ°²ÅàÁ¦´óС²»±ä£®ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®½ðÊô°ôÏòÓÒ×öÔȼõËÙÖ±ÏßÔ˶¯
B£®½ðÊô°ôÔÚx=1 m´¦µÄËٶȴóСΪ0.5m/s
C£®½ðÊô°ô´Óx=0Ô˶¯µ½x=1m¹ý³ÌÖУ¬ÍâÁ¦FËù×öµÄ¹¦Îª-0.175 J
D£®½ðÊô°ô´Óx=0Ô˶¯µ½x=2m¹ý³ÌÖУ¬Á÷¹ý½ðÊô°ôµÄµçÁ¿Îª2C

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸