câu 36
câu 37
câu 38
câu 39
câu 40
câu 41
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Câu 35.
\(\xi_b=\xi=9V\)
\(r_b=\dfrac{r}{n}=\dfrac{r}{2}=\dfrac{2}{2}=1\Omega\)
\(R_Đ=\dfrac{U^2_Đ}{P_Đ}=\dfrac{3^2}{3}=3\Omega\)
\(R_{tđ}=\dfrac{R_1\cdot R_2}{R_1+R_2}+R_Đ=\dfrac{10\cdot10}{10+10}+3=8\Omega\)
Chọn A.
Câu 36.
\(I_Đ=I_m=\dfrac{\xi_b}{r_b+R_{tđ}}=\dfrac{9}{1+8}=1A\)
\(I_{Đđm}=\dfrac{P_Đ}{U_Đ}=\dfrac{3}{3}=1A\)
Vậy đèn sáng bình thường.
Chọn B
Câu 37.
\(U_2=U_{12}=I_{12}\cdot R_{12}=I\cdot R_{12}=1\cdot5=5V\)
\(I_2=\dfrac{U_2}{R_2}=\dfrac{5}{10}=0,5A\)
\(Q_{R_2tỏa}=R_2\cdot I_2^2t=10\cdot0,5^2\cdot2\cdot60=300J\)
Không có đáp án!!!
Câu 38.
Công suất trên toàn mạch:
\(P=\xi\cdot I=9\cdot1=9W\)
Điện năng sản ra trong toàn mạch 5 phút:
\(A=P\cdot t=9\cdot5\cdot60=2700J\)
Chọn C.
Câu 40.
Hiệu suát nguồn:
\(H=\dfrac{R_{tđ}}{r+R_{td}}=\dfrac{8}{1+8}=88,89\%\approx89\%\)
Chọn B
1 Has your homework been finished
2 Why wasn't he helped
3 How many game have been played by the team
4 Where is English spoken?
5 Who is being kept in the kitchen
6 How can this safe be opened
7 What books are being read this year
8 How was the lost man found by the police
9 By whom are the children looked after for you
10 How long has the doctor been waited
11 What time can their papers be handed in by the boys
12 By whom are you lent this book
13 How many marks are given to you by the teacher
Bài làm:
( 37 +24) .41 +( 50 -9) .39
= 61 .41 +41 .39
= 41 ( 61 +39)
= 41 .100
=4100
# Học tốt:))
37. They used to go to school by bike when they were young
38. Quang suggested that they sould visit the Royal Citadel first
39. The car was too expensive for my dad to buy
40. My teacher told me to follow his instruction if I wanted to pass that module
38 Quang suggested that the Royal Citadel should be visited first
39 The car was too expensice for my dad to buy
40 My teacher told me to follow his instructions if I wanted to pass this module
37 He suggested that Sue buy that picture as an anniversary present for Jack
38 You know the man who sat next to me at the meeting last night, don't you?
39 Covid 19 prevented us from travelling to Da Lat
40 If I had much money, I could buy that house immediately
Câu 36: A
Câu 37: D
Câu 38: C
Câu 39: C
Câu 40: B
Câu 41: D
thank bạn nhìu , không biết tí nx bạn còn online khum , nếu còn vô chỉ bài mình nha :3