I need these answers! 1. Pressure can usually be calculated from what other stat
ID: 1331242 • Letter: I
Question
I need these answers!
1. Pressure can usually be calculated from what other state variables?
Volume and temperature.
Temperature and density.
Density and volume.
Temperature and mass.
2. A pipe with diameter 5.0 cm carries water flowing at 0.50 m/s. Further downstream, the pipe narrows to a diameter of 3.0 cm. How fast is the water moving through that portion of the pipe?
1.4 m/s.
0.18 m/s.
0.83 m/s.
0.30 m/s.
3. King Fahd's Fountain, in Jeddah, Saudi Arabia, is the world's tallest. It reaches a height of 260 m. What must be the pressure above atmospheric in the supply pipe to send the water that high?
25 ATM.
29 ATM.
14 ATM.
35 ATM.
Viscosity in fluids works to
transport momentum along streamlines.
speed up the average flow.
slow down the average flow.
transport momentum from one streamline to another.
a.Volume and temperature.
b.Temperature and density.
c.Density and volume.
d.Temperature and mass.
2. A pipe with diameter 5.0 cm carries water flowing at 0.50 m/s. Further downstream, the pipe narrows to a diameter of 3.0 cm. How fast is the water moving through that portion of the pipe?
1.1.4 m/s.
2.0.18 m/s.
3.0.83 m/s.
4.0.30 m/s.
3. King Fahd's Fountain, in Jeddah, Saudi Arabia, is the world's tallest. It reaches a height of 260 m. What must be the pressure above atmospheric in the supply pipe to send the water that high?
a.25 ATM.
b.29 ATM.
c.14 ATM.
d.35 ATM.
Explanation / Answer
1. Pressure can usually be calculated from
Volume and temperature: PV = nRT
Temperature and density if molecular weight is also known as V/n = Molecular mass/density
It cannot be found by c and d
2. Velocity * area = constant
=> 0.5 * pi (2.5)2 = v * pi (1.5)2
=> v = 1.389 m/s = 1.4 m/s (approximately)
3. P1 - P2 = 260 m * 1000 kg/m^3 * 9.81 m/s^2 = 2550600 Pa = 25 atm
4. Viscosity in fluids works to slow down the average flow.
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