Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259877827
Author: CENGEL
Publisher: MCG
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Chapter 1, Problem 22P
What is the weight, in N, of an object with a mass of 150 kg at a location where
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If the mass of an object is 10 lbm, what is its weight, in lbf, at a location where g = 32.0 ft/s2 ?
A spherical balloon holding 25 lb of air has a diameter of 9 ft. For the air, determine(a) the specific volume, in ft3/lb, and (b) the weight, in lbf. Let g = 31.0 ft/s2.
The mass of an airplane at sea level (g = 32.174 ft/s2) is 10 metric tons.
Find its (a) mass in lbm, slugs, and kg and (b) its weight in lbf and Newtons when the airplane is traveling at a 55,000 ft elevation. The acceleration of gravity decreases by 3.35 x 10-6 ft/s2 for each foot of elevation.
Chapter 1 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 1 - What is a fluid? How does it differ from a solid?...Ch. 1 - Define internal, external, and open-channel flows.Ch. 1 - Define incompressible flow and in compressible...Ch. 1 - Consider the flow of air over the wings of an...Ch. 1 - What is forced flow? How does it differ from...Ch. 1 - How is the Mach number of a flow defined? That...Ch. 1 - When an airplane is flying at a constant speed...Ch. 1 - Consider the flow of air at a Mach number of 0.12....Ch. 1 - What is the no-slip condition? What causes it?Ch. 1 - What is a boundary layer? What causes a boundary...
Ch. 1 - What is a steady-flow process?Ch. 1 - Define stress, normal stress, shear stress, and...Ch. 1 - What are system, surroundings, and boundary?Ch. 1 - When analyzing the acceleration of gases as they...Ch. 1 - When is a system a closed system, and when is it a...Ch. 1 - You are to understand how a reciprocating air...Ch. 1 - What is the difference between pound-mass and...Ch. 1 - In a news ankle, is stated that a recently...Ch. 1 - Explain why the light-year has the dimension of...Ch. 1 - What is the net force acting on a car cruising at...Ch. 1 - A man goes to a traditional market to buy a steak...Ch. 1 - What is the weight, in N, of an object with a mass...Ch. 1 - What is the weight of a 1-kg substance in N,...Ch. 1 - Determine the mass and the weight of the air...Ch. 1 - A 3-kW resistance heater a water beater...Ch. 1 - A195-Ibm astronaut took his bathroom scale (a...Ch. 1 - The acceleration of high-speed aircraft sometimes...Ch. 1 - A 10-kg rock is thrown upward with a force of 280...Ch. 1 - The value of the gravitational acceleration g...Ch. 1 - At 45° latitude: the gravitational acceleration as...Ch. 1 - 1-32 The gravitational constant g is 9.807m/s2 at...Ch. 1 - On average, an adult person breathes in about 7.0...Ch. 1 - While solving a problem, a person ends up with...Ch. 1 - An airplane flies horizontally at 70m/s . Its...Ch. 1 - If the airplane of Prob. 1-35 weighs 17 lbf,...Ch. 1 - The boom of a fire truck raises a fireman (and his...Ch. 1 - A 6-kg plastic tank that has a volume of 0.18m3 is...Ch. 1 - Water at 15°C from a garden hose fills a 1.5 L...Ch. 1 - A forklift raises a 90.5 kg crate 1.80 m. (a)...Ch. 1 - The gas tank of a car is filled with a nozzle that...Ch. 1 - A pool of volume V (in m3) is to filled with water...Ch. 1 - Based on unit considerations alone, show that the...Ch. 1 - What is the importance of modeling in engineering?...Ch. 1 - What is the difference between the analytical and...Ch. 1 - When modeling an engineering process, how is the...Ch. 1 - What is the difference between precision and...Ch. 1 - How do the differential equations in the study of...Ch. 1 - What is the value of the engineering software...Ch. 1 - The weight of bodies may change somewhat from one...Ch. 1 - The reactive force developed by a jet to push an...Ch. 1 - An important design consideration in two-phase...Ch. 1 - Consider the flow of air through a wind turbine...Ch. 1 - A tank is filled with oil whose density is =850...Ch. 1 - If mass, heat, and work are not allowed to cross...Ch. 1 - The speed of an aircraft is given to be 260 m/s in...Ch. 1 - One J/kg is equal to (a) 1kPam3 (b) 1kNm/kg (c)...Ch. 1 - Which is a unit for power? (a) Btu (b) kwh (c)...Ch. 1 - The speed of an aircraft is given to be 950 km/h....Ch. 1 - The weight of a 10-kg mass at sea level is (a)...Ch. 1 - The weight of a 1 -Ibm mass is (a) 1Ibmft/s2 (b)...Ch. 1 - A hydroelectric power plant operates at its rated...Ch. 1 - Write an essay on the various mass- and...Ch. 1 - Search the Internet to find out how to properly...Ch. 1 - Another unit is kgf, which is a force unit used...Ch. 1 - Discuss why pressure tests of pressurized tanks...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A bucket contains 20 kg of liquid water and 1.5 kg of air in 0.773 m3. The specific volume of liquid water is approximately 0.001 m3/kg. Determine the specific volume of air. 0.502 A cylindrical container of 0.18 m and length 0.5 m has water steam at 3 bar and is surrounded by atmospheric pressure (1 bar). Determine the net outward force on the container, in kN. The surface area of the cylinder accounts for two end caps (circles of area ) and the axial surface (area rdL) 634.5arrow_forwardA gas with a density of 1.0 lb/ft3 weighs 4.0 lbf on the Moon, where the acceleration of gravity is 5.47 ft/s2.Determine its weight, in lbf, and volume, in ft3, on Mars, where g = 12.86 ft/s2.arrow_forwardA closed system consisting of 10 lb of air undergoes a polytropic process from p₁-70 lbf/in², v₁-4 ft³/lb to a final state where p2 - 20 Ibf/in², v₂-12 ft³/lb. Determine the polytropic exponent, n, and the amount of energy transfer by work, in Btu, for the process. Step 1 Your answer is correct. Determine the polytropic exponent, n, for the process. n-11402 Hint Step 2 Determine the amount of energy transfer by work, in Btu, for the process. W- i Btu Attempts: 1 of 4 usedarrow_forward
- 10 kg gas is contained in a vertical piston-cylinder assembly by a piston weighing 40 Kg and having a face area of 60 cm². The atmosphere exerts a pressure of 101.3 kPa on the top of the piston. An electrical resistor transfers energy to the gas in the amount of 5.3 kJ as the elevation of the piston increases by 0.6 m. The piston and cylinder are poor thermal conductors and friction can be neglected. 1. Sketch a figure of the process 2. Determine the change in internal energy of the gas, in kJ, assuming it is the only significant internal energy change of any component present.arrow_forwardAs shown on the right, a vertical piston–cylinder assembly containing a gas is placed on a hot plate. The piston initially rests on the stops. With the onset of heating, the gas pressure increases. At what pressure, in bar, does the piston start rising? The piston moves smoothly in the cylinder and g = 9.81 m/s2.arrow_forward2°C 500 //(Kg.°C), is The quantity of heat required to raise the temperature of 500 g of iron by given that the specific heat capacity is 500 kJ 05 kJ 2 KJ O250 KJarrow_forward
- What is the weight of an astronaut with a mass of 180 LBM on the moon, where g=5.32 ft/s2?arrow_forwardThe drag force, Fd, imposed by the surrounding air on a vehicle moving with velocity Vis given by F- CAPV²/2 where C is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and p is the air density. An automobile is moving at V = 50 miles per hour with C = 0.28, A = 26 ft², and p = 0.075 lb/ft³. Determine the force, in lbf, and the power, in hp, required to overcome aerodynamic drag. Step 1 * Your answer is incorrect. Determine the force, in lbf, required to overcome aerodynamic drag. Fd = i 1468 lbfarrow_forwardThe drag force, Fa, imposed by the surrounding air on a vehicle moving with velocity V is given by Fa= Ca ApV²/2 where Cd is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and p is the air density. An automobile is moving at V = 50 miles per hour with C = 0.28, A = 25 ft2, and p = 0.075 lb/ft³. Determine the force, in lbf, and the power, in hp, required to overcome aerodynamic drag. Step 1 Determine the force, in lb, required to overcome aerodynamic drag. F = i lbfarrow_forward
- The density of atmospheric air varies with elevation, decreasing with increasing altitude.arrow_forwardAccording to Newton’s law of cooling, the rate at which the temperature of an object changes is proportional to the difference between its temperature and that of its surroundings. A cup of coffee at 200◦ in a room of temperature 70◦ is stirred continually and reaches 100◦ after 10 min. At what time was it at 120◦?arrow_forwardThree-tenths kilogram of a gas is contained within a piston-cylinder assembly. The gas undergoes a process for which the pressure-volume relationship is PVA1.6 = constant. The initial pressure is 73 psi, the initial volume is 10 ft3, and the final volume is 15 ft3. The change in specific internal energy of the gas in the process is 35 kJ/kg. There are no significant changes in kinetic or potential energy. Determine the net heat transfer for the process, in kJ. Select one: а. 11.66 b. -4.4 С. 40.8 d. 61.8arrow_forward
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