ʱ : 最新山东省烟台?018年中考物理真题试?含解? - 百度文库ϿʼĶ
Ʒĵ
015VᱻջУR0ڵ·У˿У̣ѹãܱѹѹ̶
װͣͼ֪Ƭ¶ˣʱֵѹʾﵽֵ15V Ե·еI=I0=IR=
=
=0.15A
R0ֵR0====60
2װֵͣʱ·еԴѹһP=С
·СʣPС=
=
=3.6W
֪·
ʱƬһˣ϶ˣʱֻR0·У· P=
=
=9.6W
·ĵĵ繦ʵı仯Χ3.6W9.6W
3ͼ֪ʼֵ·УѹʾUV=IRܷӦı仯ҵ·еʼմֵP=٣ͼĵ·ƿԽܡ
ʴΪ1У˿У̣𱣻·ãУֵΪ60 2·ĵĵ繦ʵı仯Χ3.6W9.6W 3ͼҵƴܺĵĽǶȿŵǽԼܡ
ԲΪ龰˵·ơ·صŷķɶԼ繦ʹʽӦãܺϷ·ŵѧܵʶ塣
272018?̨ͼijػֹˮƽʾͼʹõǻ飬ϸ˿շɾɵġǰػԵѹǿΪ210PaijҵУ0.25m/sٶʱػԵѹǿΪ2.310PaͬĹʽ0.2m/sٶʱػԵѹǿΪ2.410PaƸ˿غĦ 1ػ֮ȡ
2ػʱĻеЧ֮ȡ 3ʱĻеЧǶ٣ Ʒĵ
5
5
5
֪·йСW=Pt֪ͬʱڵ·ĵĵ
Ʒĵ
1֪ǰʱʱԵѹǿͬѹǿʽԵѹػصıʽ֮ȣ 2P==
=Fv֪ĴС֮ȣݦ=
=
=
ػ
ʱĻеЧ֮ȡ 3Ƹ˿غĦF=
F=
óGGҵĹϵ
Ƹ˿غĦݦ==⻬ĻеЧʡ
𡿽⣺1ػΪGΪGףΪGң ǰػԵѹG=p1S
ʱػԵѹG+G=p2S ʱػԵѹG+G=p3S G=p2p1SG=p3p1S
=G=mg
=
=
=
=
=٣
2P===FvͬĹʽٶȳɷȣ
= =Ʒĵ
==
==
Ʒĵ
ɢۢܵã
ػʱĻеЧ֮ȡ
=
3Ƹ˿غĦF= F=
ޣ
==
ɢݢ۵ãɢ٢ã G=
=
Ƹ˿غĦʱĻеЧǣ ɢߣ=
=
=
=
=80%
𣺣1ػ֮Ϊ34
2ػʱĻеЧ֮Ϊ1516
3ʱĻеЧ80%
Ϊѧۺ⣬ѧѹǿʽеЧʹʽʹʽպãؼһúùƵʽP=FvúòĦF=G+G
Ʒĵ