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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:
\(p_2=dh_2=10000\left(80-20\right).10^{-2}=6000\left(Pa\right)\)
\(h=80 cm =0,8m\)
\(l=20cm=0,2m\)
\(d=10000N/m^3\)
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)
Tóm Tắt:
h1=2m
d=10000N/m3
x=0,5m
------------------
p1=?N/m3
p2=?N/m3
Giải
+Áp suất của nước lên đáy thùng là:
p1=d.h1=10000.2=20000(N/m3)
+Áp suất của nước lên một điểm cách đáy thùng 0,5m là:
p2=d.h2=10000.(2-0,5)=15000(N/m3)
Đáp số:p1=20000 N/m3
p2=15000 N/m3
Tóm tắt:
\(d=10000\left(\dfrac{N}{m^3}\right)\)
\(h=90cm=0,9m\)
\(h'=\left(90-30\right)=60cm=0,6m\)
\(p=?Pa\)
\(p'=?Pa\)
GIẢI:
Áp suất tác dụng lên đáy thùng là:
\(p=dh=10000\cdot0,9=9000\left(Pa\right)\)
Áp suất tác dụng lên cách đáy thùng:
\(p'=dh'=10000\cdot0,6=6000\left(Pa\right)\)
10000 N/m3 là TLR của nước nhé.
Áp suất lên đáy thùng là :
\(P_đ=d.h_{thùng}=10000\times0.9=9000\left(Pa\right)\)
Áp suất lên điểm cách đ 30 cm là:
\(P_h=10000\times0.6=6000\left(Pa\right)\)
Kết luận...
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:
\(h=p:d=15000:10000=1,5m\)
Áp suất của người đó là
\(p=d.h=10000.\left(1,2-0,4\right)=8000\left(Pa\right)\)
Áp suất của nước ở đáy thùng là: P1 = d.h1 = 10000.1,2 = 12000 N/m2
Áp suất của nước lên điểm cách đáy thùng là 0,4 m là: P2 = d.h2 = 10000.(1,2 – 0,4) = 8000 N/m2
\(p=d_nh\Rightarrow h=\dfrac{p}{d_n}=\dfrac{4000}{10000}=0,4\left(m\right)\)
\(P_A=d_nh_A\Rightarrow h_A=\dfrac{P_A}{d_n}=\dfrac{6000}{10000}=0,6\left(m\right)\)
< Bạn kiểm tra lại đề nhé>
Uhm, đề thiếu chiều cao của thùng nhé!
đề cô t cho không có chiều cao