ʱ : 【附20套中考模拟试卷】甘肃省定西岷县联?019-2020学年中考物理模拟试卷含解析 - 百度文库ϿʼĶ
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һѡ⣨10С⣬30֣ 1C ⡿
ڼĹУٶȱ죬ܱ߶ӣܱܺͳΪеܣԻеܱ 2D ⡿
A֪ٶȴС,֪ʱС,Ƚ·̴С,A; B֪ٶȴС,֪·̴С,ȽʱС,B; CDֱ˶ʱ,ٶȴСֲ,ٶȵĴСv?Dȷ.
DѡȷΪ. 3B
漰֪ʶǹϵ·պϿSƶָ뼸̶ָߡ˵·Ƕ·ѹָƫת˵ѹĵ·ǽͨģ·ǵL1 4C
ķֱµģкöӦã鹤̨ǷˮƽǽǷֱǽϹҵĻǷȣ ⡿
Ϊ˰껭ͨǵ껭ʹ껭ijشƽУΪֱ£껭ı߳Ҳֱ£ʱ껭ˣѡC 5B ⡿
AL1L2L1L1ĵҵӡ-룬ӡ+
s,stĴС,CtӷA⣻
BL1L2·L1L2ĵB⣻ CL1L2L2C⣻
DL1L2L1L1ĵD⣮ 㾦
L1L2õL1L2ܵݵȷʹ÷Ӧڸ·ϣõӡ+룬ӡ- 6D ⡿
ƬPʱ·ΪLļ·ŷķɿ֪ʱ·еĵ ƬPƶʱ·ĵŷķɿ֪·еС ƬPҶʱ·еĵСҲΪ0 ۺϷ֪ͼΪDͼ ѡD 7D ⡿
A¶ӰܴСһأΨһأ¶ȸߵܲһAȷ Bıܵķ֣ȴݣҶǵЧģ¶߲һBȷ
Cӣ¶Ȳһߣ磺ۻȻȣ¶ȱֲ䣮Cȷ
D¶ߣ˶Ӿ磬ӶӣӶܺͷܺΪܣDȷ 8B
AǸɫжϵģ Bȷܰʯ飻 CԴģ DָȣӦѡB 㣺Ҫ 9A
⡿
ԸΪоGC֧F֧ΪlG֧Ϊl֧ݸܸƽɵãF֧l֧=GlGˮƽFABƶľ飬F֧ڼСGlG䣬ݸܸƽ֪֧֧ģԿ֪˶CѹҲӰĦСؿ֪Cľ䡢C͵ĦľC˶ܵĦƽСĦСƽ֪ˮƽFҲA⣬BCD⡣ 10A ⡿
Aˮı4.2103 J/(kg103 Jȡ)Ϊ1 kgˮ¶()1 (ų)4.2Aȷ
BǸֻ˵ա͡ų˵СBѡ˵ Cܺ¶ȡ״̬йϵܵ¶ȾܵĶ٣C
DQ=qmȫȼշųQֵqmйϵֵȼȫȼշųһ࣬D
ѡ⣨3С⣬12֣ 11BD ⡿
A.ͼ֪A1·A2ƵĵѹԴѹƬƶʱѹʾ䣬A
B.ƬPƶʱRĵI?U ֪ͨĵСݲ·RĹɿ֪·СA1ʾСBȷ
C.·и֧·Ӱ죬ԻƬƶʱͨƵĵֲ䣬ƵȲ䣬C
D.BCѡ֪A1ʾСƵȲ䣬Dȷ 12ACD
ɵ·ͼ֪L뻬RѹV1L˵ĵѹѹV2R˵ĵѹ·еĵ
1ĻƬPijʱѹV1V2ʾ֮Ϊ4Vݴ·ĵѹص
Դĵѹ
2R·еĵʱֵõĵѹ·еĵСݴжϳͼҶӦĵѹΪV2ŷķ·еĵ裻ͼҿ֪·еĵʱѹV2ʾݴ·ĵѹصV1ʾȻѹжϳʱӦﵽʣ·еĵС·ĵܹŷķ·еСֵP=UIݵĶʺ͵·ĵʡ ⡿
ɵ·ͼ֪L뻬RѹV1 L˵ĵѹѹV2 R˵ĵѹ·еĵ
֪ĻƬPijʱѹV1 V2 ʾ֮Ϊ4Vɴ·ĵѹص֪Դĵѹ4VAȷ
ɵ·ͼ֪ڱ֤·ԪȫΧڣR·еĵʱֵõĵѹѹV2 ʾʱ·еܵ·еĵСɴ֪ͼҶӦǵѹV2ҵ·еСIС =0.1Aʱѹʾ3V I?·еֵǣR2?U֪RU2IС?3V?30?ͼ֪·е0.1AСʱ·еĵֵI =0.5AʱѹV2 ʾU2С =1.5VʱӦǡôﵽʣ·ĵܹ·еСֵ
R2С?U2I?1.5V?3?ԻȡֵΧ330Cȷ 0.5Aʱ˵ĵѹǣUL =U-U2С=4V-1.5V=2.5V
0.5A=1.25WB ݵĶǣPL =UL I =2.5V
0.5A=2WDȷ ·ĵǣP=UI=4VѡACD 㾦
Ǵ·صŷķɡ繦ʹʽӦãĹؼȷжϳͼҶӦĵѹжϳʱĵѹۺǿ̸ӣһѶȡ 13BD ⡿
A. ֻպS1·ֻеR1ͻƬƶ·еСA1ʾСR1Ƕֵ裬˵ѹСV1ʾС˵ѹǵԴѹͶֵ˵ѹ֮V2ʾʴ