giúp mik vs
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a, \(W=W_đ+W_t=\dfrac{1}{2}mv_A^2+mgz_A=\dfrac{1}{2}.0,5.30^2=225J\)
b, Do vật chỉ chịu tác dụng của lực thế nên theo định luật bảo toàn cơ năng:
\(W_A=W_B\)
\(\Leftrightarrow\dfrac{1}{2}m.v^2_A+mgz_A=\dfrac{1}{2}mv_B^2+mgz_B\)
\(\Leftrightarrow\dfrac{1}{2}0,5.30^2+0,5.10.0=\dfrac{1}{2}0,5.0^2+0,5.10.z_B\)
\(\Leftrightarrow z_B=45\left(m\right)\)
Vậy độ cao cực đại mà vật đạt được là \(45m\)
1) shouldn't
2) its
3) any
4) though
5) spent
6) on
7) because
8) has
9) Don't
10) There is
\(8,\Rightarrow\left(x-\dfrac{1}{2}\right)^3=\dfrac{3}{8}-\dfrac{1}{2}=-\dfrac{1}{8}=\left(-\dfrac{1}{2}\right)^3\\ \Rightarrow x-\dfrac{1}{2}=-\dfrac{1}{2}\Rightarrow x=0\\ 11,\Rightarrow\left(x-2\right)\left(2-x\right)=33\left(-297\right)\\ \Rightarrow\left(x-2\right)^2=9801\Rightarrow\left[{}\begin{matrix}x-2=99\\x-2=-99\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=101\\x=-97\end{matrix}\right.\)
8) \(\Rightarrow\left(x-\dfrac{1}{2}\right)^3+\dfrac{1}{2}=\dfrac{3}{8}\)
\(\Rightarrow\left(x-\dfrac{1}{2}\right)^3=-\dfrac{1}{8}\)
\(\Rightarrow x-\dfrac{1}{2}=-\dfrac{1}{2}\Rightarrow x=0\)
11) ĐK: \(x\ne2\)
\(\Rightarrow\left(x-2\right)\left(2-x\right)=-297.33\)
\(\Rightarrow-x^2+4x-4=-9801\)
\(\Rightarrow-\left(x-101\right)\left(x+97\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=101\left(tm\right)\\x=-97\left(tm\right)\end{matrix}\right.\)
4:
a: OA<OB
=>A nằm giữa O và B
=>OA+AB=OB
=>AB=2cm
b: AO<AC
=>O nằm giữa A và C
mà AO=1/2AC
nên O là trung điểm của AC
How much does this pan cost?
My mother cook better than I do
It was such a hard cake that I could not eat it
How much did you weight?
Gordon is a excellent cook
You had better not eat too much red meat because it can raise this risk of your heart diseases and cancers
Fried
frozena
boiling
sugar?
sweetness
addition
Bài 5:
a: P(x)-Q(x)
=2x^3-x^2+5x-7-x^3-3x^2+4x-1
=x^3-4x^2+9x-8
P(x)+Q(x)
=2x^3-x^2+5x-7+x^3+3x^2-4x+1
=3x^3+2x^2+x-6
b: Q(2)=2^3+3*2^2-4*2+1=13
........by air always makes me nervous
...........the first time we've ever heard such a great song!
.........the guitar better than I do
........taken a French course three weeks ago
......forward to watching the samba parade in Rio Carnival
mik nhầm nhé đây là môn Địa Lí.
giúp mik nhé nhanh mik k