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Tóm tắt:
\(d=10000N/m^3\\ h_1=2m\\ h_2=30cm=0,3m-----\\ p_1=?N/m^2\\ p_2=?N/m^2\)
Giải:
Áp suất của nước tác dụng lên một điểm ở đáy thùng: \(p=d.h_1=10000.2=20000\left(N/m^2\right)\)
Độ sâu ở một điểm cách đáy thùng 30cm: \(h=2-0,3=1,7\left(m\right)\)
Áp suất của nước tác dụng ở một điểm cách đáy thùng 30cm:
\(p_2=d.h_2=10000.1,7=17000\left(N/m^2\right).\)
BT8:
Áp suất của nước ở đáy thùng là: P1 = d.h1 = 10000.1,5 = 15000 N/m2
Áp suất của nước lên điểm cách đáy thùng là 0,6 m là: P2 = d.h2 = 10000.(1,5 – 0,6) = 9000 N/m2.
BT9: 15dm = 1.5m.
Áp suất của nước ở đáy thùng là: P1 = d.h1 = 10000.2 = 20000 N/m2
Áp suất của nước lên điểm cách đáy thùng là 1,5 m là: P2 = d.h2 = 10000.(2 – 1,5) = 5000 N/m2.
8 . Áp suất nước tác dụng lên đáy thùng :
\(p=dh=10000.1,5=15000\left(Pa\right)\)
Áp suất nước tác dụng lên điểm cách đáy 0,6 m là :
\(p'=dh'=10000.\left(1,5-0,6\right)=9000\left(Pa\right)\)
9 . Áp suất nước tác dụng lên đáy thùng :
\(p=dh=10000.2=20000\left(Pa\right)\)
Áp suất nước tác dụng lên điểm cách đáy 15 dm là :
\(p'=dh'=10000.\left(2-1,5\right)=5000\left(Pa\right)\)
\(h=80 cm =0,8m\)
\(l=20cm=0,2m\)
\(d=10000N/m^3\)
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)
Áp suất của nước lên đáy thùng là:
\(p=d.h=10,000.1,2=12,000\left(Pa\right)\)
Áp suất lên điểm cách đáy thùng
\(p=d.h=10,000.\left(1,2-0,4\right)=8000\left(Pa\right)\)
\(a,d=10000,\dfrac{N}{m^3}\\ h=1,3m\\ \Rightarrow p=d.h=10000.1,3=13000\left(Pa\right)\)
\(b,h_A=1,3m-40cm=1,3m-0,4m=0,9m\\ \Rightarrow p_A=d.h_A=10000.0,9=9000\left(Pa\right)\)
\(c,h_{A'}=1,3m-0,3m=1m\)
\(So.sánh:h_A< h_{A'}\left(0,9m< 1m\right)\\ \Rightarrow d.h_A< d.h_{A'}\\ Hay.p_A< p_{A'}\\ Vậy.áp.suất.tăng\)
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...
Áp suất nước tác dụng lên đáy thùng:
\(p=d\cdot h=10000\cdot0,9=9000Pa\)
Áp suất nước tác dụng lên một điểm cách đáy thùng 0,3m:
\(p=d\cdot\left(h-0,3\right)=10000\cdot\left(0,9-0,3\right)=6000Pa\)