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FORWARD OPERATING BASE MAINTAIN, FORT STEWART - From a distance, the cluster of brown, dome tents appeared serene on this training base in the heart of Fort Stewart. But inside the canvas walls, the carnage of war swirled as briskly as the winds ...
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Other Compressed Air Flow Meter Results
Open Question: Physical science Q's PLZ HELP!?
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
1. If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2, what is the pressure inside of the balloon?
(1 point)
0.5 N/m2
1 N/m2
1.5 N/m2
2 N/m2
2. Where is fluid pressure greatest?
(1 point)
30 centimeters below the surface of a swimming pool
1 meter below the surface of a swimming pool
2 meters below the surface of a swimming pool
The pressure is the same in all parts of a swimming pool
3. Which of the following is not possible?
(1 point)
compressing 10 liters of oxygen gas into a 1 liter volume
compressing 2 liters of water into a 1 liter volume
filling a balloon using helium gas from a pressurized tank
allowing 5 liters of compressed air to expand to a volume of 100 liters
4. The operation of a hydraulic lift system is explained by
(1 point)
Archimede’s principle.
Bernoulli’s principle.
Newton’s principle.
Pascal’s principle.
5. The hydraulic system of a dump truck is designed to multiply
(1 point)
distance.
force.
pressure.
speed.
6. Which of the following statements is true about an airplane wing during flight?
(1 point)
Air above the wing travels faster than air below the wing.
Air below the wing travels faster than air above the wing.
The wing exerts pressure equally in all directions.
The lift acting on the wing reduces the weight of the wing.
7. A brick weighs 21 N. Measured underwater, it weighs 12 N. What is the size of the buoyant force exerted by the water on the brick?
(1 point)
33 N
21 N
12 N
9 N
8. The strength of the buoyant force acting on an object in a fluid depends on the object’s
(1 point)
mass.
surface area.
volume.
weight.
Completion
Complete each sentence or statement.
9. Pressure is the result of force distributed over a(an) _____________.
(1 point)
10. A substance that flows and assumes the shape of its container is a(an) _____________.
(1 point)
11. The direction of the buoyant force on an object placed in fluid is ________________.
(1 point)
moreOpen Question: help i need to do good on this test !?
1. A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change?
A. 0.124764 meter
B. 0.00023635 meter
please help if u do i will choose u the best plz just true answers and show work and links
thanks and have a good day
C. 0.00002363 meter
D. 0.0000189 meter
2. When the molecules in a body move with increased speed, it's possible that the body will change from a
A. gas to a liquid.
B. gas to a solid.
C. liquid to a solid.
D. liquid to a gas.
3. If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 273°C.
B. 327°C.
C. 705°C.
D. 873°C.
4. The main purpose of the turbine in the turbojet engine is to
A. drive the compressor.
B. compress the air.
C. increase the velocity of the exhaust gases.
D. reduce the temperature of the exhaust gas.
5. 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.)
A. 5 cubic inches
B. 10 cubic inches
C. 40 cubic inches
D. 100 cubic inches
6. Unlike other kinds of liquids, volatile liquids
A. ignite readily at a relatively low temperature.
B. flow rapidly at a relatively low temperature.
C. evaporate rapidly at a relatively low temperature.
D. freeze readily at a relatively high temperature.
7. A temperature of 273 K is the temperature at which water
A. boils.
B. lacks any moving molecules.
C. evaporates.
D. freezes.
8. Which of the following takes place in the combustion chamber of a gas turbine engine?
A. Fuel oil is stored with sufficient pressure.
B. Fuel oil is mixed with a proper portion of compressed air.
C. A mixture of fuel oil and compressed air is ignited.
D. Gases are cooled to a desired temperature.
9. How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
A. 314 J
B. 6,573 J
C. 1,314,718 J
D. 4,187,000 J
10. One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A. 1.702 kPa
B. 3.636 kPa
C. 510 kPa
D. 854.46 kPa
12. A temperature of 20°C is equivalent to approximately
A. -6°F.
B. 32°F.
C. 68°F.
D. 136°F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.
14. Which one of the following substances is a liquid fuel used in rocket engines?
A. Liquid oxygen
B. Ammonia
C. Potassium perchlorate
D. Codium nitrate
15. The density of water is the greatest at a temperature of
A. 0 K.
B. 4 K.
C. 273 K.
D. 277 K.
16. In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the
A. piston.
B. cylinder.
C. combustion chamber.
D. intake valve.
17. How much heat is required to convert 0.3 kilogram of ice at 0°C to water at the same temperature?
A. 100,375 J
B. 167,292 J
C. 334,584 J
D. 450,759 J
18. Which of the following cools the air in a household refrigerator?
A. Reduction of the air temperature due to condensation of the gaseous refrigerant
B. The transfer of heat from the air to the compressor due to expansion of the gaseous refrigerant
C. The transfer of heat to the evaporator due to compression of the liquid refrigerant
D. Absorption of the heat from the air due to evaporation of the liquid refrigerant
19. Which one of the following temperatures is equal to 5°C?
A. 0 K
B. 41 K
C. 278 K
D. 465 K
20. Liquid alcohol will change to vapor when its temperature reaches the
A. boiling point.
B. fusing point.
C. freezing point.
D. melting point.
21. A temperature of 200°F is equivalent to approximately
A. 37.8°C.
B. 93.3°C.
C. 232°C.
D. 840°C.
22. A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.)
A. 0.0006 m3
B. 0.2146 m3
C. 0.2333 m3
D. 0.3198 m3
23. Which of the following statements correctly describes the position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine?
A. The intake valve is closed and the exhaust valve is open.
B. The intake valve is open and the exhaust valve is closed.
C. Both the intake valve and the exhaust valve are closed.
D. Both the intake valve and the exhaust valve are open.
24. What is the length of an aluminum rod at 65°Cthanks and have a nice day if u want u could help with 2 more questions
moreVoting Question: help help science please?
1)If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2 , what is the pressure inside of the balloon? (1pt)
a.0.5 N/m2
b. 1 N/m2
c. 2 N/m2
2)Where is fluid pressure greatest? (1pt)
a.30 centimeters below the surface of a swimming pool
b.1 meter below the surface of a swimming pool
c.2 meters below the surface of a swimming pool
3)Which of the following is not possible? (1pt)
a.Compressing 10 liters of oxygen gas into a 1 liter volume
b.Compressing 2 liters of water into a 1 liter volume
c.Filling a balloon using helium gas from a pressurized tank
4)The operation of a hydraulic lift system is explained by ____________. (1pt)
a.Bernoulli’s principle
b.Newton’s principle
c.Pascal’s principle
5)The hydraulic system of a dump trunk is designed to multiply ___________. (1pt)
a.Distance
b.Force
c.Pressure
6)Which of the following statements is true about an airplane wing during flight? (1pt)
a.Air above the wing travels faster than air below the wing
b.Air below the wing travels faster than air above the wing
c.The wing exerts pressure equally in all directions
7)A brick weights 21 N. Measured underwater, it weighs 12 N. What is the size of the buoyant force exerted by the water on the brick? (1pt)
a.21 N
b.12 N
c.9 N
8)The strength of the buoyant force acting on an object in a fluid depends on the object’s __________. (1pt)
a.Surface area
b.Volume
c.Weight
9)Pressure is the result of force distributed over a(n) __________. (1pt)
10)A substance that flows and assumes the shape of its container is a(n) __________. (1pt)
11)The direction of the buoyant force on an object placed in fluid is __________. (1pt)
SHORT ANSWER
12)If you know the air pressure exerted on a tabletop, how can you calculate the force exerted on the tabletop? (3pts) Hint: think about what calculation you will use. (addition, subtraction, multiplication, or division)
13)For a fluid that is not moving, what are the two factors that determine the pressure that the fluid exerts? (3pts)
14)Why aren’t two organisms that live on the seafloor crushed by water pressure? (3pts) Hint: they obviously are thriving in that environment so the water pressure does not affect them. They did not “travel” down there to live so they must have been born there.
15)How are density and buoyancy related? (3pts) Hints: define both and look at the similarities
16)In the figure, a force of 1000 N is exerted on Piston 1 of the hydraulic lift shown. What force will be exerted on Piston 2? Show your work.
Hint: multiplication and division is involved in this problem.i looked in my text book and i want to make shore im right
moreVoting Question: I have a Unit test that I need to make sure my answers are correct.?
1. If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2, what is the pressure inside of the balloon?
(1 point)
0.5 N/m2
1 N/m2
1.5 N/m2
2 N/m2
2. Where is fluid pressure greatest?
(1 point)
30 centimeters below the surface of a swimming pool
1 meter below the surface of a swimming pool
2 meters below the surface of a swimming pool
The pressure is the same in all parts of a swimming pool
3. Which of the following is not possible?
(1 point)
compressing 10 liters of oxygen gas into a 1 liter volume
compressing 2 liters of water into a 1 liter volume
filling a balloon using helium gas from a pressurized tank
allowing 5 liters of compressed air to expand to a volume of 100 liters
4. The operation of a hydraulic lift system is explained by
(1 point)
Archimede’s principle.
Bernoulli’s principle.
Newton’s principle.
Pascal’s principle.
5. The hydraulic system of a dump truck is designed to multiply
(1 point)
distance.
force.
pressure.
speed.
6. Which of the following statements is true about an airplane wing during flight?
(1 point)
Air above the wing travels faster than air below the wing.
Air below the wing travels faster than air above the wing.
The wing exerts pressure equally in all directions.
The lift acting on the wing reduces the weight of the wing.
7. A brick weighs 21 N. Measured underwater, it weighs 12 N. What is the size of the buoyant force exerted by the water on the brick?
(1 point)
33 N
21 N
12 N
9 N
8. The strength of the buoyant force acting on an object in a fluid depends on the object’s
(1 point)
mass.
surface area.
volume.
weight.
Completion
Complete each sentence or statement.
9. Pressure is the result of force distributed over a(an) _____________.
(1 point)
10. A substance that flows and assumes the shape of its container is a(an) _____________.
(1 point)
11. The direction of the buoyant force on an object placed in fluid is ________________.
(1 point)
Short Answer
12. If you know the air pressure exerted on a tabletop, how can you calculate the force exerted on the tabletop?
(3 points)
13. For a fluid that is not moving, what are the two factors that determine the pressure that the fluid exerts?
(3 points)
14. Why aren’t organisms that live on the seafloor crushed by water pressure?
(3 points)
15. Compare the size and direction of the lift on a plane with its weight as it flies at a constant speed and altitude.
(3 points)
16. How are density and buoyancy related?
(3 points)
Problem
17. In the figure, a force of 1000 N is exerted on Piston 1 of the hydraulic lift shown. What force will be exerted on Piston 2? Show your work.
(5 points)
moreVoting Question: i need help i really dont understand and please EARTH SCIENCE?
1. A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change?
A. 0.124764 meter
B. 0.00023635 meter
C. 0.00002363 meter
D. 0.0000189 meter
2. When the molecules in a body move with increased speed, it's possible that the body will change from a
A. gas to a liquid.
B. gas to a solid.
C. liquid to a solid.
D. liquid to a gas.
3. If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 273°C.
B. 327°C.
C. 705°C.
D. 873°C.
4. The main purpose of the turbine in the turbojet engine is to
A. drive the compressor.
B. compress the air.
C. increase the velocity of the exhaust gases.
D. reduce the temperature of the exhaust gas.
5. 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.)
A. 5 cubic inches
B. 10 cubic inches
C. 40 cubic inches
D. 100 cubic inches
6. Unlike other kinds of liquids, volatile liquids
A. ignite readily at a relatively low temperature.
B. flow rapidly at a relatively low temperature.
C. evaporate rapidly at a relatively low temperature.
D. freeze readily at a relatively high temperature.
7. A temperature of 273 K is the temperature at which water
A. boils.
B. lacks any moving molecules.
C. evaporates.
D. freezes.
8. Which of the following takes place in the combustion chamber of a gas turbine engine?
A. Fuel oil is stored with sufficient pressure.
B. Fuel oil is mixed with a proper portion of compressed air.
C. A mixture of fuel oil and compressed air is ignited.
D. Gases are cooled to a desired temperature.
9. How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
A. 314 J
B. 6,573 J
C. 1,314,718 J
D. 4,187,000 J
10. One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A. 1.702 kPa
B. 3.636 kPa
C. 510 kPa
D. 854.46 kPa
12. A temperature of 20°C is equivalent to approximately
A. -6°F.
B. 32°F.
C. 68°F.
D. 136°F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.
14. Which one of the following substances is a liquid fuel used in rocket engines?
A. Liquid oxygen
B. Ammonia
C. Potassium perchlorate
D. Codium nitrate
15. The density of water is the greatest at a temperature of
A. 0 K.
B. 4 K.
C. 273 K.
D. 277 K.
16. In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the
A. piston.
B. cylinder.
C. combustion chamber.
D. intake valve.
17. How much heat is required to convert 0.3 kilogram of ice at 0°C to water at the same temperature?
A. 100,375 J
B. 167,292 J
C. 334,584 J
D. 450,759 J
18. Which of the following cools the air in a household refrigerator?
A. Reduction of the air temperature due to condensation of the gaseous refrigerant
B. The transfer of heat from the air to the compressor due to expansion of the gaseous refrigerant
C. The transfer of heat to the evaporator due to compression of the liquid refrigerant
D. Absorption of the heat from the air due to evaporation of the liquid refrigerant
19. Which one of the following temperatures is equal to 5°C?
A. 0 K
B. 41 K
C. 278 K
D. 465 K
20. Liquid alcohol will change to vapor when its temperature reaches the
A. boiling point.
B. fusing point.
C. freezing point.
D. melting point.
21. A temperature of 200°F is equivalent to approximately
A. 37.8°C.
B. 93.3°C.
C. 232°C.
D. 840°C.
22. A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.)
A. 0.0006 m3
B. 0.2146 m3
C. 0.2333 m3
D. 0.3198 m3
23. Which of the following statements correctly describes the position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine?
A. The intake val
moreVoting Question: what is the differance between NCM/hr, CM/hr for Compressed air flow metering?
in the factory where i am working, we want to measure the flow rate of compressed air. I have confusion between normal cubic meter per hour (NCM/hr) and cubic meter per hour (CM/hr).
Please response... thanks
moreResolved Question: Science Help??? Hey i really need help so if you know any of this stuff please help!?
1. If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2, what is the pressure inside of the balloon?
A. 0.5 N/m2
B. 1 N/m2
C. 1.5 N/m2
D. 2 N/m2
2. Where is fluid pressure greatest?
A. 30 centimeters below the surface of a swimming pool
B. 1 meter below the surface of a swimming pool
C. 2 meters below the surface of a swimming pool
D. The pressure is the same in all parts of a swimming pool
3. Which of the following is not possible?
A. compressing 10 liters of oxygen gas into a 1 liter volume
B. compressing 2 liters of water into a 1 liter volume
C. filling a balloon using helium gas from a pressurized tank
D. allowing 5 liters of compressed air to expand to a volume of 100 liters
4. The operation of a hydraulic lift system is explained by
A. Archimede’s principle.
B. Bernoulli’s principle.
C. Newton’s principle.
D. Pascal’s principle.
5. The hydraulic system of a dump truck is designed to multiply
A. distance.
B. force.
C. pressure.
D. speed.
6. Which of the following statements is true about an airplane wing during flight?
A. Air above the wing travels faster than air below the wing.
B. Air below the wing travels faster than air above the wing.
C. The wing exerts pressure equally in all directions.
D. The lift acting on the wing reduces the weight of the wing.
7. A brick weighs 21 N. Measured underwater, it weighs 12 N. What is the size of the buoyant force exerted by the water on the brick?
A. 33 N
B. 21 N
C. 12 N
D. 9 N
8. The strength of the buoyant force acting on an object in a fluid depends on the object’s
A. mass.
B. surface area.
C. volume.
D. weight.
Complete each sentence or statement.
9. Pressure is the result of force distributed over a(an) _____________.
10. A substance that flows and assumes the shape of its container is a(an) _____________.
11. The direction of the buoyant force on an object placed in fluid is ________________.
Short Answer
12. If you know the air pressure exerted on a tabletop, how can you calculate the force exerted on the tabletop?
13. For a fluid that is not moving, what are the two factors that determine the pressure that the fluid exerts?
14. Why aren’t organisms that live on the seafloor crushed by water pressure?
15. Compare the size and direction of the lift on a plane with its weight as it flies at a constant speed and altitude.
16. How are density and buoyancy related?
Problem
17. In the figure, a force of 1000 N is exerted on Piston 1 of the hydraulic lift shown. What force will be exerted on Piston 2? Show your work.
moreResolved Question: Who can help me with Physics please? 31 Chapters (just help with one more)?
1. a. What is the energy source for the motion of gases in the atmosphere? -
b. What prevents atmospheric gases from flying off into space? -
2. How does the density of gases at different elevations in the atmosphere differ from the density of liquids at different depths? -
3. What causes atmospheric pressure? -
4. What is the mass of a cubic meter of air at 20°C at sea level? -
5. a. What is the mass of a column of air that has a cross-sectional area of 1 square centimeter and that extends from sea level to the top of the atmosphere? –
b. What is the weight of this air column? –
c. What is the pressure at the bottom of this column? -
6. Is the value for atmospheric pressure at the surface of Earth a constant? -
7. How does the pressure at the bottom of 76-cm column of mercury in a barometer compare with the pressure due to the weight of the atmosphere? -
8. When you drink liquid through a straw, it is more accurate to say the liquid is pushed up the straw rather than sucked up the straw. What exactly does the pushing? -
9. Why will a vacuum pump not operate for a well that is deeper than 10.3 m? -
10. The atmosphere does not ordinarily crush cans. Yet it will crush a can after it has heated, capped, and cooled. Why? -
11. Why can an aneroid barometer be used to measure altitude? -
12. When air is compressed, what happens to its density? -
13. a. How great is the buoyant force on a balloon that weighs 1 N when it is suspended by buoyancy in air? –
b. What happens if the buoyant force decreases? –
c. What happens if the buoyant force increases? -
14. When the speed of a fluid flowing in a horizontal pipe increases, what happens to the internal pressure in the fluid? -
15. a. What are streamlines? –
b. Is the pressure greater or less in regions where streamlines are crowded? -
16. Does Bernoulli’s principle provide a complete explanation for wing lift, or is there some other significant factor? -
17. Why does a spinning ball curve in flight? –
Plug and Chug
18. The “height” of the atmosphere is about 30 km. The radius of Earth is 6400 km. What percentage of Earth’s radius is the height of the atmosphere? -
19. The weight of the atmosphere above 1 square meter of Earth’s surface is 100 000 newtons. If the density of the atmosphere were a constant 1.2 kg/m3, calculate where the top of the atmosphere would be. -
20. Calculate the approximate weight of air in your classroom. -
moreResolved Question: Does this make sense?
The ocean covers approximately 71% of the earth’s surface. The mystery of the deep has fascinated people for thousands of years and scuba diving has allowed people to discover it for themselves. Even though much of the bottom of the world’s oceans is unexplored and unmapped, scuba diving allows ordinary people to explore and experience part of the underwater world.
Scuba is the acronym for Self Contained Underwater Breathing Apparatus. A portable metal tank attached to the back of a diver supplies compressed for people to stay underwater for great lengths of time. Scuba diving as a recreational sport is becoming more popular nowadays. Recreational diving uses only compressed air as the breathing mixture, is never done solo, does not exceed a depth of 40 metres and doesn’t require decompression stops. Professional diving, used for military, governmental, commercial and scientific purposes, serves a specific mission for each dive and divers are paid to dive. Technical diving exceeds recreational limits but is not for profit. The nature of their diving and type of equipment used exceed the boundaries of Recreational Scuba Diving.
Make any changes you want, to me this doesn't flow nicely. Thanks :)
moreResolved Question: Rotameter gas flow calculations?
I just want to make sure I have this right...
I have a rotameter (ball in tube) flow meter on the inlet of a piece of apparatus. Gas is compressed air. Rotameter is calibrated for air at stp. The outlet of the apparatus is at atmospheric pressure. There is a significant pressure drop across the apparatus. I want to know the flow rate of air released to atmosphere.
Disregarding temperature and pressure variations from standard conditions,
volumetric flow rate through meter V = Vi * SQR( Pin / Pstd )
Where Vi = indicated flow rate, Pin = inlet pressure, Pstd = standard atmospheric pressure.
Outlet flow rate from apparatus Vo = V * ( Pin / Pstd )
So:
Vo = Vi * SQR( Pin / Pstd ) * ( Pin / Pstd )
Eg. if pressure is 1 bar above atmospheric, reading is 1.0 lpm, outlet flow will be 2.828 lpm.
Am I correct?Just to clarify: The needle valve at the rotameter inlet is fully open. Flow is limited by the apparatus. Pressure drop across the rotameter is negligible."How can you have two different flows in the same circuit?"
Because I am talking about volumetric flow and the pressure is changing. If I was talking about mass flow all flow rates would be the same.
moreResolved Question: need physics problems help?
If you can answer even one question, please show how
1) (a)With what velocity is a steel ball with 1mm in radius falling in a tank of glycerin at an instant when its acceleration is half of that of a freely falling body.
(b) What is the terminal velocity of the ball?
density of steel = 8.5 gm/cc
density of glycerin = 1.32 gm/cc
viscosity of glycerin = 8.3 poise
(2) Water flows through a horizontal pipe of 10cm^2. In one section, cross-sectional area is 5cm^2. The pressure difference between the 2 cross sections is 300 pa. How many cubic metres of water will flow out of the pipe in one minute?
(3) Water at 20 degrees Celsius flows with a speed of 50 cm/s through a pipe of diameter 3mm.
(a) calculate Reynold's number
(b) what is the nature of the flow?
(4) Water in an enclosed tank is subjected to a gauge pressure 2 x 10^4 pa applied by compressed air introduced to the top of the tank. There is a small hole in the side of the tank 5m below the level of the water. Calculatespeed with which water escapes from the hole.
moreVoting Question: How to monitor the Compressed Dry Air usage in the plant? ?
We have 9 compressors with a total of 24300 cfm used in the plant around the clock for the manufacturing process. We have flow meters at the main headers in different sections, but it still does not give us a clear reading as to how much CDA is used for the production purpose.
Apart from installing flow sensors at each branch of the CDA piping is there any other cost effective method to find out the usage of CDA?
There is a BAS to monitor the whole system and we need these reading to make the plant more energy efficient by minimizing the wastage. .
moreResolved Question: How can I measure flow rate near the bottom of a lake?
Here's what I'm trying to do: I need to measure the flow rate of water in certain places of a lake, and at different depths in those places. At the surface, it's fairly easy (put a stick in the water and track how long it takes to go a meter etc.). Where I'm stumped is trying to measure the flow near the bottom, or at any significant depth, for that matter. I would need some way to make an object submerge and stay at a depth where I can watch it move. Someone has suggested a Cartesian Diver, which seems like a really good idea, except that you have to compress all the air around the diver to make it sink, and I can't exactly do that on the surface of the lake. If you can think of any way to modify the Cartesian Diver experiment to make it helpful, or any idea at all on how I could do this, please describe it in full!
moreResolved Question: i need a motorised compressed air cleaner?
to run on a track (or similar) and blow compresssed air to clean a guillotine blade after it has cut it would need to travel 3 metres one way and then return but providing a constant air flow the motor could be electric or air driven has anyone seen anything similar in industry it would need to fit in a channel about 300mm x 300mm x 3 m .The compressed air supply is there already
moreResolved Question: need help with this please help?
A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change
A. 0.124764 meter
B. 0.00023635 meter
C. 0.00002363 meter
D. 0.0000189 meter
When the molecules in a body move with increased speed, it's possible that the body will change from a
A. gas to a liquid.
B. gas to a solid.
C. liquid to a solid.
D. liquid to a gas.
3. If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 273°C.
B. 327°C.
C. 705°C.
D. 873°C.
4. The main purpose of the turbine in the turbojet engine is to
A. drive the compressor.
B. compress the air.
C. increase the velocity of the exhaust gases.
D. reduce the temperature of the exhaust gas.
5. 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.)
A. 5 cubic inches
B. 10 cubic inches
C. 40 cubic inches
D. 100 cubic inches
6. Unlike other kinds of liquids, volatile liquids
A. ignite readily at a relatively low temperature.
B. flow rapidly at a relatively low temperature.
C. evaporate rapidly at a relatively low temperature.
D. freeze readily at a relatively high temperature.
7. A temperature of 273 K is the temperature at which water
A. boils.
B. lacks any moving molecules.
C. evaporates.
D. freezes.
8. Which of the following takes place in the combustion chamber of a gas turbine engine?
A. Fuel oil is stored with sufficient pressure.
B. Fuel oil is mixed with a proper portion of compressed air.
C. A mixture of fuel oil and compressed air is ignited.
D. Gases are cooled to a desired temperature.
9. How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
A. 314 J
B. 6,573 J
C. 1,314,718 J
D. 4,187,000 J
10. One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A. 1.702 kPa
B. 3.636 kPa
C. 510 kPa
D. 854.46 kPa
12. A temperature of 20°C is equivalent to approximately
A. -6°F.
B. 32°F.
C. 68°F.
D. 136°F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.
moreResolved Question: Refrigeration, air/cond: would this work? Use the force of rising ocean waves as a piston in a cylinder for a?
compressor? Say we use air, for simplicity and to avoid polluting. We use a large sealed cylinder (several meters wide?), and water is the piston. A wave swells up, it compresses air inside at the top. A relief valve lets the air out to a heat exchanger (submerged in ocean water, so it is both power source and heat sink.) Compressed air leaves heat exchanger cooler and goes through another heat exchanger in a space to be cooled. Air picks up heat and returns to bottom of the cylinder; it bubbles up through water to the top, to be compressed again. A poppet valve keeps water from flowing back into air tubing; the water forms a seal around the tube rising into the cylinder. This is similar to (unliquified) gas storage tanks.
We need chains/cables attached to a floating platform the system is built on, so that as tide rises and lowers daily, the throw of the piston (rise of the wave swell) stays about the same.
Feasible? How efficient? Suggestions? Thanks for all serious answers!
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