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Zolol [24]
3 years ago
14

Water flows at 12 m/s in a horizontal pipe with a pressure of 3.0 104 n/m2. if the pipe widens to twice its original radius, wh

at is the pressure in the wider section?
Mathematics
1 answer:
Alexxx [7]3 years ago
7 0
Total pressure is constant and PT = P = 1/2*ρ*v^2 So p1 + 1/2*ρ*v1^2 = p2 + 1/2*ρ*v2^2 and from continuity we have ρ*A1*v1 = ρ*A2*v2 So v2 = v1*A1/A2 since r2 = 2r1 then A2 = 4A1 so v2 = v1/4 Now from above p2 = p1 + 1/2*ρ*v1^2 - 1/2*ρ*v2^2 = p1 + 1/2*ρ*v1^2 - 1/2*ρ*v1^2/4^2 So p2 = 3.0x10^4Pa + 1/2*1000kg/m^3*(12m/s)^2 - 1/2*1000kg/m^3*12^2/16 = 9.75x10^4Pa = 9.8x10^4Pa
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Which is the approximate measure of this angle? A. 30° B. 60° C. 105° D. 120°
tensa zangetsu [6.8K]
B is the answer. Think of a clock, one hand at 12 and one hands at 3 is 90 degrees. That is a little less than 90 degrees so it's approximately 60 degrees.
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3 years ago
1-8n-6n&gt;1<br> Solve by simplying into shorter equation
kenny6666 [7]
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7 0
3 years ago
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An arithmetic series has seven terms. the first term is 5 and the last term is 53. find the sum of the series!
Kisachek [45]
The easiest way is to use (& to memorize) the sum formula for a AP:


Sum = 1st term added to the last term & multiplied by half the number of terms
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5 0
3 years ago
Distance between A (2, -1) and (2,a) is 4 units. Find the value of a where a is positive.
kolezko [41]

Answer:

a = 3

Step-by-step explanation:

Calculate the distance d using the distance formula and equate to 4

d = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2    }

with (x₁, y₁ ) = (2, - 1) and (x₂, y₂ ) = (2, a)

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a = 3

3 0
2 years ago
The sum of three numbers is 121 The third number is 3 times the second. The first number is 6 times the second. The first number
Mama L [17]

Answer:

The first number is

72.6

Step-by-step explanation:

Let second number be x.

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First number= 6x=6×12.1=72.6

Third number=3x=3×12.1=36.3

3 0
2 years ago
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