Homework Answers
How do surfactants stabilize liquid bubbles? To explore this, consider a 2 mM concentration of surfactant...
How do surfactants stabilize liquid bubbles? To explore this, consider a 2 mM concentration of surfactant added to water. If each surfactant molecule occupies on average an area of 0.7 nm^2, determine the change in pressure inside a liquid bubble of diameter 2 cm compared to a liquid bubble formed from pure water.
Water at 20 C flows through the 20-mm diameter galvanized iron pipe such that it discharges...
Water at 20 C flows through the 20-mm diameter galvanized iron pipe such that it discharges at C from the fully opened gate valve B at 0.003 m/s Pe 998 3 kg/m3 and 100(10 ) m2/s Use the Part A Determine the required pressure at A Include the minor losses of the four elbows and gate valve. Express your answer to three significant figures and include the appropriate units. equation市一1.8kg(#)1.11 + 3.7 Figure 1 of 1 PA: I Value Units...
1. For water at 20 C flowing through a straight smooth pipe at 0.06 m/h, the...
1. For water at 20 C flowing through a straight smooth pipe at 0.06 m/h, the pipe diameter for which transition to turbulence will occur is approximately a. 1.0 cm b. 1.5 cm c.2.0 cm d. 2.5 cm e. 3.0 cm 2. Find the Reynold number, the roughness parameter, the friction factor f and the pressure drop for flow of water at 20 C through a 5 cm diameter pipe of roughness height E=0.5 mm if the flow rate is...
20. A cylindrical water tower of diameter 3.0 m supplies water to a house. The level of water in the water tower is 35 m above the point where the water enters the house through a pipe that has an...
20. A cylindrical water tower of diameter 3.0 m supplies water to a house. The level of water in the water tower is 35 m above the point where the water enters the house through a pipe that has an inside diameter 5.0 cm. The pressure at the top of the water tower is I ATM and the water in the cylindrical tank flows slowly at a speed of 0.01 cm/s. At what speed does the water flow in the...
. Consider an air bubble with radius 0.1 um in water at 20 °C: a. Calculate...
. Consider an air bubble with radius 0.1 um in water at 20 °C: a. Calculate the overpressure inside the bubble and show your calculation procedures. (The surface tension of water is 72.8 mNm-1) b. Calculate the vapor pressure of water inside the bubble, relative to that over a flat water surface. Show your calculation procedures. (The surface tension of water: 72.8 mN m-1 the molecular weight of water:18 g mol1; the gas constant R: 8.314 J-mol1K-)
A drinking straw 20 cm long and 3.0 mm in diameter stands vertically in a cup...
A drinking straw 20 cm long and 3.0 mm in diameter stands
vertically in a cup of juice 8.0 cm in diameter. A section of straw
6.8 cm long extends above the juice. A child sucks on the straw,
and the juice level begins dropping at 2.2 mm/s .
By how much does the pressure in the child's mouth differ from
atmospheric pressure?
What is the greatest height above the water surface from which
the child could drink, assuming this...
A frictionless piston/cylinder apparatus 100 mm in diameter contains water vapor with a quality of 20%....
A frictionless piston/cylinder apparatus 100 mm in diameter contains water vapor with a quality of 20%. The piston, which has a mass of 16 kg, is floating on the vapor 50 mm above the bottom of the cylinder. Stops above the piston prevent it from moving upward more than 30 mm. Heat is added until the temperature reaches 400?C. Find: a. the initial pressure b. the mass of water c. the quality when the piston hits the stops d. the...
Question 4 A water pipe having a 2.77 cm inside diameter cames water into the basement...
Question 4 A water pipe having a 2.77 cm inside diameter cames water into the basement of a house at a speed of 0.918 m/s and a pressure of 245 kPa. If the pipe tapers to 1.16 cm and rises to the second floor 6.24 m above the input point, what are the (a) speed and (b) water pressure at the second floor? (a) Number Units (b) Number Units Click if you would like to Show Work for this questions...
Problem 5. (20 pts) A vertical propane tank with an outside diameter of D 300 mm...
Problem 5. (20 pts) A vertical propane tank with an outside diameter of D 300 mm and a wall-thickness of t-9 mm is subjected to a horizontal force of P 41 kN. The gage pressure inside the tank is 7 MPa. [D-300 mm, te9 mm, P 41 kN] a) Determine the maximum normal stress at point K b) Determine the shear stress produced by the applied force. c) Determine the maximum shear stress in the 3d stress element.
4. A straw of diameter 20 mm and 26 cm long stands vertically in a cup...
4. A straw of diameter 20 mm and 26 cm long stands vertically in a cup of Mazoe (density approximately equal to water) 10 cm in diameter. 8.5 cm of the straw extends above the Mazoe. A MU first year student in lecture group B, sucks on the straw and the level of the Mazoe begins to drop a rate of 0.75 cm/s. a. Find the speed of the Mazoe inside the straw. b. Calculate the pressure difference in the...
Water at 20 C flows through the 20-mm diameter galvanized iron pipe such that it discharges at C from the fully opened gate valve B at 0.003 m/s Pe 998 3 kg/m3 and 100(10 ) m2/s Use the Part A Determine the required pressure at A Include the minor losses of the four elbows and gate valve. Express your answer to three significant figures and include the appropriate units. equation市一1.8kg(#)1.11 + 3.7 Figure 1 of 1 PA: I Value Units...
1. For water at 20 C flowing through a straight smooth pipe at 0.06 m/h, the pipe diameter for which transition to turbulence will occur is approximately a. 1.0 cm b. 1.5 cm c.2.0 cm d. 2.5 cm e. 3.0 cm 2. Find the Reynold number, the roughness parameter, the friction factor f and the pressure drop for flow of water at 20 C through a 5 cm diameter pipe of roughness height E=0.5 mm if the flow rate is...
20. A cylindrical water tower of diameter 3.0 m supplies water to a house. The level of water in the water tower is 35 m above the point where the water enters the house through a pipe that has an inside diameter 5.0 cm. The pressure at the top of the water tower is I ATM and the water in the cylindrical tank flows slowly at a speed of 0.01 cm/s. At what speed does the water flow in the...
A drinking straw 20 cm long and 3.0 mm in diameter stands
vertically in a cup of juice 8.0 cm in diameter. A section of straw
6.8 cm long extends above the juice. A child sucks on the straw,
and the juice level begins dropping at 2.2 mm/s .
By how much does the pressure in the child's mouth differ from
atmospheric pressure?
What is the greatest height above the water surface from which
the child could drink, assuming this...
Question 4 A water pipe having a 2.77 cm inside diameter cames water into the basement of a house at a speed of 0.918 m/s and a pressure of 245 kPa. If the pipe tapers to 1.16 cm and rises to the second floor 6.24 m above the input point, what are the (a) speed and (b) water pressure at the second floor? (a) Number Units (b) Number Units Click if you would like to Show Work for this questions...
Problem 5. (20 pts) A vertical propane tank with an outside diameter of D 300 mm and a wall-thickness of t-9 mm is subjected to a horizontal force of P 41 kN. The gage pressure inside the tank is 7 MPa. [D-300 mm, te9 mm, P 41 kN] a) Determine the maximum normal stress at point K b) Determine the shear stress produced by the applied force. c) Determine the maximum shear stress in the 3d stress element.
4. A straw of diameter 20 mm and 26 cm long stands vertically in a cup of Mazoe (density approximately equal to water) 10 cm in diameter. 8.5 cm of the straw extends above the Mazoe. A MU first year student in lecture group B, sucks on the straw and the level of the Mazoe begins to drop a rate of 0.75 cm/s. a. Find the speed of the Mazoe inside the straw. b. Calculate the pressure difference in the...
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Question 501 pts
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