2018ʡ˳пԾ
һѡиѡУֻһѡ⣬ÿС3֣15֣ 1й˵ȷǣ
Aֻз˵ʱܴġʶ B͵ŲܴϢҶд CҪɹڿ
DпڼѧУ·νֹȣԴ
2ʵԪʱȡѧзһʯīϩƳɵġȱڵԪϣܴȽ͵Ԫʱ¶ȡȱΪʯīϩ A۵ BԺ
CԺ
DԺ
3¶г̬仯ȷǣ
AҲɣ BԡҵľӱģҺ
CӾˮго䣬 Dձչƹ˱ڣ
4ͼʾСˮƽϣ빳˶ͻȻС
A˶ԽԽ Bֹͣ˶ Cǰ˶
DܵĦԽԽ
5ͼʾ·ԴѹΪ12Vұֲ䡣պϿSƬPڱеʱѹʾΪ4VƬPڱbʱѹʾ仯2V
10sڶֵR1Ϊ60Jнȷǣ
A·еСΪ1.5A
BƬPеʱ9sڻRĵĵΪ60J CRȺĵĵ繦֮Ϊ8s9 DR1Ⱥĵĵ繦֮Ϊ4s3
գÿ2֣32֣
6Сڻϣ·ľƶ Ϊվʱ帽ٶȺܴʹ帽 СΪ˿ͱг¹ʷ˿һҪվڰȫ⡣
7ͼʾ5Nһ20Nѹֱǽϣ崦ھֹ״̬ʱܵĦС N
8죬ݱҶʱСŵŨIJҶζ Ϊ2kgˮ¶ȴ20ȵ70ʱˮյ J
9СͬѧڲⶨҺܶȵʵУûаǶβҺ¼±СݱеҺܶ g/cm3 g
ʵ ҺV/cm3 Һm/g 1 15 67 2 22 72.6 3 50 95 4 80 119 10˽ͼʾװã20sʱڽ700NصĻ4m֪ӵΪ500NùУװõĻеЧΪ ˶ĹΪ W
11ȻһȼϣвֳʹȻͻͣȻ ѡԴóΪ1.5tܽӴΪ0.1m2ֹʱˮƽѹǿ Pa
12һСʢˮձABϷϵȦͼʾĵ·SպϺСƯˮϣʱAΪ ƬPСܸ ѡС䡱
13ͼԴѹ㶨R1=30R2=60S3պϣS1S2ϿʱʾΪ0.1AԴѹ VS3ϿS1S2պʱʾ A
.̽18֣
146֣ڡ̽ɡʵУ
1ͼףƽй䣬ϳһСĹߣĽf= cmʵǰӦ桢ߵģʹ ߶ϡ
2ʵУľͼʾʱڹϿɵõһĵ ʵƳɵĹѧ
3ʵʱʵʱϳ̣ڹϵλûƶ
ѡϡ¡
4ͼ֮һ۾ֹϵģˣƶʵٴγ۾ ۾ѡӡԶӡ
156֣סλͬѧһܸ̽ƽʵ飬ԸܸеΪ֧㣬ͼ1ͼ2ʾ
1ʵӦܸ˵ڵˮƽλƽ⣬ĿΪܸضʵӰ ܸҶ˵˸ߣΪʹˮƽλϾֹӦ˵ƽĸ˵ ҡ
2ͼ1ʾܸˮƽλƽ⣬¼ݡһʵݣͬѧóܸ˵ƽIJǣ
3ͼ2ʾͬѧʵ鷽һֵɲֱΪF1ڶֵɲбΪF2 һʵ鷽㡣ͬ£εɲƶF1 F2ԡ 4ܸкܶӦáʹͼ3ʾľֹΰ巢תСŮҿɲȡ
166֣̽ĹϵʵУСѡ5102025ʵ飬·ͼͼʾ