ÌâÄ¿ÄÚÈÝ
3£®ÓÐÒ»ÖÖ²âÁ¿ÈËÌåÖصĵç×Ó³Ó£¬ÆäÔÀíͼÈçͼÖеÄÐéÏßËùʾ£¬ËüÖ÷ÒªÓÉÈý²¿·Ö¹¹³É£ºÌ¤°åºÍѹÁ¦¸Ü¸ËABO¡¢Ñ¹Á¦´«¸ÐÆ÷R£¨Ò»¸ö×èÖµ¿ÉËæѹÁ¦´óС¶ø±ä»¯µÄµç×èÆ÷£©£¬ÏÔʾÌåÖصÄÒDZíG£¨ÆäʵÖÊÊǵçÁ÷±í£©£¬ÆäÖÐAO£ºBO=5£º1£®ÒÑ֪ѹÁ¦´«¸ÐÆ÷µÄµç×èÓëÆäËùÊÜѹÁ¦µÄ¹ØϵÈçϱíËùʾ£º
ѹÁ¦F/N | 0 | 50 | 100 | 150 | 200 | 250 | 300 | ¡ |
µç×èR/¦¸ | 300 | 270 | 240 | 210 | 180 | 150 | 120 | ¡ |
Ôò£º£¨1£©ÀûÓñíÖÐÊý¾Ý¹éÄɳöµç×èRËæѹÁ¦F±ä»¯µÄº¯Êý¹Øϵʽ£ºR=300-0.6F£¨¦¸£©£»
£¨2£©¸Ã³ÓÁã¿Ì¶ÈÏߣ¨¼´Ì¤°å¿ÕÔØʱµÄ¿Ì¶ÈÏߣ©Ó¦±êÔÚµçÁ÷±í¿Ì¶ÈÅÌ15.6ºÁ°²´¦£»
£¨3£©Èç¹ûijÈËÕ¾ÔṲ́°åÉÏ£¬µçÁ÷±í¿Ì¶ÈÅÌʾÊýΪ20mA£¬Õâ¸öÈ˵ÄÌåÖØÊÇ550N£®
·ÖÎö £¨1£©¸ù¾Ý±í¸ñÖеÄÊý¾Ý¿ÉÖª£ºÑ¹Á¦FÔö´óʱ£¬µç×è¼õС£¬ÓÉÊýѧ¹éÄɳöµç×èRËæѹÁ¦F±ä»¯µÄº¯Êýʽ£®
£¨2£©Ì¤°å¿ÕÔØʱ£¬Óɱí¸ñ¿ÉÖªF=0£¬µç×èR=300¦¸£¬ÓÉÅ·Ä·¶¨ÂÉÇó³öµçÁ÷£®
£¨3£©¸ù¾ÝµçѹÓëµçÁ÷¿ÉÇó³ö´ËʱѹÁ¦´«¸ÐÆ÷µÄµç×èÖµ£¬ÔÙÒÀ¾Ý±íÖеı仯¹æÂÉ¿ÉÇó³ö´Ëʱ×÷ÓÃÔÚAµãµÄѹÁ¦µÄ´óС£¬×îºó¸ù¾Ý¸Ü¸ËµÄƽºâÌõ¼þµÃ³ö×÷ÓÃÔÚBµãµÄÈ˵ÄÌåÖØ£»
½â´ð ½â£º£¨1£©ÓɱíÖÐÊý¾Ý¿É¹éÄɵóö£ºR=300-0.6F£¨¦¸£©
£¨2£©ÒÀÌâÒâ¿ÉÖª£¬µç×Ó³Ó¿ÕÔØʱѹÁ¦´«¸ÐÆ÷Êܵ½µÄѹÁ¦Îª0£¬Óɱí¿ÉÖª£¬´ËʱѹÁ¦´«¸ÐÆ÷µÄµç×èR1=300¦¸£¬µç·ÖеĵçÁ÷Ϊ£º
I=$\frac{U}{R}$=15.6mA£¬ËùÒԸóÓÁã¿Ì¶ÈÏßÓ¦±êÔÚµçÁ÷±í¿Ì¶ÈÅ̵Ä15.6mA´¦£®
£¨3£©µ±µçÁ÷±í¿Ì¶ÈÅ̵ĶÁÊýΪI2=20ºÁ°²Ê±£¬Ñ¹Á¦´«¸ÐÆ÷µÄµç×è${R}_{2}^{\;}=\frac{U}{{I}_{2}^{\;}}=\frac{4.68}{0.02}=234¦¸$£¬ÓÉR=300-0.6F2£¬ËãµÃF2=110N£¬
ÔÙÓÉF2•AO=G•BOµÃG=550N
¹Ê´ð°¸Îª£º£¨1£©R=300-0.6F£¨¦¸£©
£¨2£©15.6
£¨3£©550N
µãÆÀ ±¾ÌâÊÇÉú»îÖеÄÎÊÌ⣬¿¼²éÓ¦ÓÃÎïÀí֪ʶ´¦Àíʵ¼ÊÎÊÌâÄÜÁ¦£¬¹Ø¼üÔÚÓÚ½¨Á¢ÎïÀíÄ£ÐÍ£®
A£® | Éϸ¡Ò»Ð© | B£® | ¾²Ö¹²»¶¯ | C£® | ϳÁһЩ | D£® | ÎÞ·¨È·¶¨ |
A£® | µç×Ó´ïµ½N°å˲¼äµÄËÙ¶ÈΪ$\sqrt{\frac{2eU}{m}}$ | |
B£® | µç×Ó´ÓµÆË¿K³ö·¢´ïµ½N°åËù¾ÀúµÄʱ¼äΪL$\sqrt{\frac{m}{2eU}}$ | |
C£® | µç·Îȶ¨µÄijʱ¿Ì£¬MNÖ®¼äÔ˶¯µÄÈȵç×ÓµÄ×ܶ¯ÄÜIL$\sqrt{\frac{2mU}{e}}$ | |
D£® | µç·Îȶ¨µÄijʱ¿Ì£¬MNÖ®¼ä¾ßÓеÄÈȵç×ÓÊý$\frac{I•L}{e}$$\sqrt{\frac{2m}{eU}}$ |
A£® | ÔÏßȦÊäÈëµçѹƵÂÊΪ100Hz | |
B£® | ÔÏßȦÊäÈëµçѹΪ$\frac{{n}_{1}{U}_{m}}{2{n}_{2}}$ | |
C£® | ÔÏßȦµçÁ÷±íʾÊýΪ$\frac{\sqrt{2}{n}_{2}{U}_{m}}{2{n}_{2}{R}_{0}}$ | |
D£® | ½«µç×èRÓëÀíÏë¶þ¼«¹Ü´®Áª£¬Ìæ»»µç×èR£¬ÔòµçѹʾÊý¼õ°ë |
A£® | ͼʾʱ¿Ì£¬ÖʵãbµÄ¼ÓËÙ¶ÈÕýÔÚÔö´ó | |
B£® | ´Óͼʾʱ¿Ì¿ªÊ¼£¬¾¹ý0.01s£¬Öʵãbͨ¹ýµÄ·³ÌΪ2m | |
C£® | ´Óͼʾʱ¿Ì¿ªÊ¼£¬¾¹ý0.01s£¬Öʵãbͨ¹ýµÄ·³ÌΪ0.4m | |
D£® | ´Óͼʾʱ¿Ì¿ªÊ¼£¬Öʵãa±ÈÖʵãbÏȻص½×Ô¼ºµÄƽºâλÖà |
A£® | ´ËºóÔÙ¾6s ¸Ã²¨´«²¥µ½x=18m ´¦ | |
B£® | MµãÔڴ˺óµÚ3s Ä©µÄÕñ¶¯·½ÏòÑØyÖáÕý·½Ïò | |
C£® | ²¨Ô´¿ªÊ¼Õñ¶¯Ê±µÄÔ˶¯·½ÏòÑØyÖáÕý·½Ïò | |
D£® | ´ËºóM µãµÚÒ»´Îµ½´ïy=-3m´¦ËùÐèʱ¼äÊÇ2s |