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Bài 1 ;
a. Áp suất của nước tại đáy thùng là
\(p=d.h=10000.1,6=16000\left(Pa\right)\)
b. Áp suất của nước tại điểm cách đáy thùng 80 cm là:
\(p=d.h=\left(1,6-0,8\right).10000=80000\left(Pa\right)\)
2.a)
\(p=d.h=10300.24=247200Pa\)
b)
\(h=\dfrac{P_{max}}{d}=\dfrac{360500}{10300}=35m\)
a) Áp suất áp dụng lên đáy thùng:
pđáy thùng = \(d.h\)\(=\)\(10000.3=30000N\)/\(m^2\)
Áp suất của nước lên điểm A:
pa\(=d.h_A=10000.2,5=25000N\)/\(m^2\)
b) Nếu điểm A có áp suất là \(15000N\)/\(m^2\) thì điểm A cách mặt thoáng là:
\(h=p:d=15000:10000=1,5m\)
a. Áp suất nước tác dụng lên đáy thùng là:
\(p=dh=10000.1,5=15000\left(Pa\right)\)
b. Áp suất của nước tác dụng lên 1 điểm cách đáy bể 60cm là:
\(p=dh=10000\left(1,5-0,6\right)=9000\left(Pa\right)\)
\(p=dh=1,2.10000=12000\left(Pa\right)\)
\(p'=dh'=10000.\left(1,2-0,4\right)=8000\left(Pa\right)\)
Độ cao tại điểm đó là :
\(h=h_1-h_2=1,2-0,4=0,8(m)\)
Áp suất tại điểm đó là :
\(p=d.h=10000.0,8=8000(Pa)\)
Áp suất tác dụng lên điểm cách mặt nước 30cm là:
\(p_1=dh_1=10000.30.10^{-2}=3000\left(Pa\right)\)
Áp suất tác dụng lên điểm cách đáy thùng 20cm là:
\(p_2=dh_2=10000\left(80-20\right).10^{-2}=6000\left(Pa\right)\)
\(50cm=0,5m-40cm=0,4m\)
\(\left\{{}\begin{matrix}p=dh=10000\cdot0,5=5000\left(Pa\right)\\p'=dh'=10000\cdot\left(1,6-0,4\right)=12000\left(Pa\right)\end{matrix}\right.\)
\(p=d_nh\Rightarrow h=\dfrac{p}{d_n}=\dfrac{4000}{10000}=0,4\left(m\right)\)
\(P_A=d_nh_A\Rightarrow h_A=\dfrac{P_A}{d_n}=\dfrac{6000}{10000}=0,6\left(m\right)\)
< Bạn kiểm tra lại đề nhé>
\(h=80 cm =0,8m\)
\(l=20cm=0,2m\)
\(d=10000N/m^3\)
Giải:
- Áp suất tác dụng lên đáy thùng:
\(p=d.h=10000.0,8=800(N/m^2)\)
- Điểm đó cách mặt thoáng:
\(h'=h-l=0,8-0,2=0,6(m)\)
- Áp suất tại điểm đó:
\(p'=d.h'=10000.0,6=600(N/m^2)\)
TK
Đổi 80cm=0,8m; 20cm=0,2 m
áp suất tác dụng lên đáy thủng và một điểm cách đáy thùng 20cm là:
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Đáp số: format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2218.5%22%20y%3D%2218%22%3E6000%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2242.5%22%20y%3D%2218%22%3EN%3C%2Ftext%3E%3Ctext%20font-family%3D%22math167c6a1e7ce56d3d6fa748ab6d9%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2254.5%22%20y%3D%2218%22%3E%2F%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2216%22%20font-style%3D%22italic%22%20text-anchor%3D%22middle%22%20x%3D%2266.5%22%20y%3D%2218%22%3Em%3C%2Ftext%3E%3Ctext%20font-family%3D%22Arial%22%20font-size%3D%2212%22%20text-anchor%3D%22middle%22%20x%3D%2277.5%22%20y%3D%2211%22%3E2%3C%2Ftext%3E%3C%2Fsvg%3E)
\(\left\{{}\begin{matrix}p=dh=10000\cdot2=20000\left(Pa\right)\\p'=dh'=10000\cdot1,2=12000\left(Pa\right)\end{matrix}\right.\)