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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
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
Áp suất tác dụng lên đáy thùng:
\(p=d\cdot h=10000\cdot1=10000Pa\)
Áp suất tác dụng lên một điểm cách đáy thùng 40cm là:
\(p'=d\cdot h'=10000\cdot\left(1-0,4\right)=6000Pa\)
Đổi: 40 cm = 0,4 m
Áp suất lên đáy thùng là:
p = d . h = 10000 . 1 = 10000 (N/m3 / Pa)
Khoảng cách đến mặt thoáng từ một điểm cách đáy thùng 40 cm là:
1 - 0,4 = 0,6 (m)
Áp suất lên một điểm cách đáy thùng 40 cm là:
p = d . h = 10000 . 0,6 = 6000 (N/m3 / Pa)
\(h=80 cm =0,8m\)
\(l=20cm=0,2m\)
\(d=10000N/m^3\)
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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Đổi: h = 80cm = 0,8m; h' = 20cm = 0,2m
Áp dụng công thức p = d.h.
Áp suất tác dụng lên đáy thùng là: p = d.h = 10000.0,8 = 8000 N/m2.
Áp suất tác dụng lên điểm cách đáy thùng 20 cm là:
pA = d.hA = d.(h - h') = 10000.(0,8 - 0,2) = 10000.0,6 = 6000 N/m2.
\(p=dh=1,2.10000=12000\left(Pa\right)\)
\(p'=dh'=10000.\left(1,2-0,4\right)=8000\left(Pa\right)\)
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 của nước là
\(p=d.h=10000.\left(2-0,8\right)=12000\left(Pa\right)\)
Áp suất của nước lên điểm đáy thùng là:
\(P=d.h=10000.2=20000\left(Pa\right)\)
Áp suất của nước lên điểm cách đáy thùng 1,4m:
\(P=d.h=10000.\left(2-1,4\right)=6000\left(Pa\right)\)