FLUID MECHANICS (LL) W/CONNECT
4th Edition
ISBN: 9781264123728
Author: CENGEL
Publisher: MCG
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Chapter 1, Problem 15CP
When is a system a closed system, and when is it a control volume?
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Chapter 1 Solutions
FLUID MECHANICS (LL) W/CONNECT
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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- Define the control volume can involve fixed, moving, real, and imaginary boundaries.arrow_forwardDoes the work required to lift a book to a high shelf depend on how fast (in seconds) you raise it.why?arrow_forwardConsider a wind turbine with a blade span diameter of 142 m installed at a site subjected to steady winds at 7 m/s. By considering the efficiency of the wind-turbine and taking the overall efficiency of the wind turbine to be 54 percent and the air density to be 1.08 kg/m3, determine the electric power (kW) generated by this wind turbine to 1 decimal place.arrow_forward
- A crater lake has a base area of 20,000 m2 , and the water it contains is 12 m deep. The ground surrounding the crater is nearly flat and is 105 m below the base of the lake. Determine the maximum amount of electrical work, in kWh, that can be generated by feeding this water to a hydroelectric power plant.arrow_forwardWhat is a quasi-equilibrium process? What is its importance in engineering?arrow_forwardWhat are the two forms of energy interactions associated with a closed system, explain it?arrow_forward
- Piston-cylinder device is doing work in the fashion such that P=2*V where the unit of the coefficient of volume is kPa/m^3. Determine the amount of the boundary work done when the volume changes from 1 m^3 to 3 m^3 ? A)8 kJ B)-16 kJ C)-8 kJ D)16 kJ E)4 kJarrow_forwardHow much work is done on helicopter by gravity? How much work is done on it by the upward thrust force? What is the magnitude of the upward thrust force (assumed constant)?arrow_forwardDetermine the specific potential energy, in kJ/kg, of an object 50 m above a datum in a location where g = 9.8 m/s2 .arrow_forward
- Determine the work done by a 1 kgm fluid system as it expand slowly in a closed system from p1 = 2.84 Mpa, V1=0.08m^3 to v2 = 0.22m^3 in accordance to the defining relations: (a) pV(InV) = c and (b) pV^14 = c. Express your answer in Calories.arrow_forwardCan a system have a higher second-law efficiency than the first-law efficiency during a process? Give examples.arrow_forwardA 2.5-m3 rigid tank initially contains air whose density is 1.18 kg/m3. The tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 5.80 kg/m3. Determine the mass of air that has entered the tank in lb.a. 25.4678lb b. 25.3399lb c. 26.4865lb d. 22.7115lbarrow_forward
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