lm hộ nha
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Bài 3:
a. \(R=p\dfrac{l}{S}=1,1.10^{-6}\dfrac{30}{0,2.10^{-6}}=165\Omega\)
b. \(Q=UIt=220\left(\dfrac{220}{165}\right).15.60=254000\left(J\right)\)
Bài 2:
a. \(R=\dfrac{U^2}{P}=\dfrac{220^2}{1000}=48,4\Omega\)
b. \(Q=UIt=220\left(\dfrac{220}{48,4}\right).4.3600=14400000\left(J\right)\)
c. \(Q'=Q.40=14400000.40=576000000\left(J\right)=120000\)kWh
\(\Rightarrow T=Q'.2100=120000.2100=252000000\left(dong\right)\)
1 C => teacher's
2 C => its
3 D => bỏ
4 A => is
5 A => is
1 C -> teacher's
2 C -> Its
3 D -> bỏ
4 A -> is
5 A -> is
IV
1 by
2 on
3 at - in
4 to
5 for
6 with
7 into
8 of
9 in
V
1 carelessly
2 increasingly
3 protection
4 unresonable
5 preservation
1 to go => go
2 is => was
3 living=> lived
4 by => on
5 smoking => smoked
6 than => as
7 since => for
8 much => more
9 keeping => kept
10 mine => from mine
1 B => worrried
2 B => didn't
3 B => play
4 A => many
5 C => to