Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 1, Problem 63P
One J/kg is equal to
(a)
(b)
(c)
(d)
(e)
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1. The unit velocity head is
a. ft-lbf/lbm
b. ft-lb/sec
c. ft-lbm/ft^3
d. ft-lbf/sec
2. Bernoulli’s equation describes
a. kinetic energy balance in laminar flow
b. mechanical energy balance in boundary layer
c. mechanical energy balance in potential glow
d. mechanical energy in turbulent flow
3. The continuity equation
a. relates work and energy
b. is only applicable to liquid
c. relates masa flow rate along a stream tube
d. stipulates that newtons second law of motion must be satisfied at every point in the fluid
In a horizontal tube, its initial section is A1 = 800 cm2 , which reduces to A2 = 600 cm2 at the end of the tube. The mass amount is 0.1 slug/s of air (p = 1.25 kg/s). Assuming ideal fluid flow and steady state, calculate the pressure difference between A1 and A2.
Answer:p1 - p2 = 1.75 kgf/m2
Radiation heat transfer occurs at a speed of:
(a) Sound
(b) Light
(c) 60,000 km/hr
(d) 350 m/s
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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- A 75-m-high water body that is open to the atmosphere is available. The mechanical energy of this water body per unit mass is (a) 736 kJ/kg (b) 0.736 kJ/kg (c) 0.75 kJ/kg (d) 75 kJ/kg (e) 150 kJ/kgarrow_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_forwardA fluid flowing in a pipe 1000 ft above the reference line at a pressure of 200 psia, specific volume of 2 ft3 /lb, velocity of 200 ft/sec and internal energy of 100 Btu/lbm. Determine (a) the total energy of the flowing fluid with respect to the reference line and (b) the specific enthalpy in Btu/lbm . Local gravity is 32 ft/sec2 .arrow_forward
- In a steady flow open system, a fluid moves between two boundaries. In boundary 1: A1 = 0.028 m2, V1 = 32.5 m/min, V1 = 0.025 m3/kg, and P1 = 300 kPaa. In boundary 2: A2 = 0.056 m2, density = 3.2 kg/m3, and P2 = 100 kPaa. Determine a) the mass flow rate; b) the velocity in boundary 2; c) the change of kinetic energy between boundaries; and d) the change in flow energy between boundaries.arrow_forwardA system has a mass velocity of 0.5 kg/s. The enthalpy, speed and height at the entrance of the system are worth respectively 55.6 Kcal/kg, 30 m/s and 90 m. At the exit, the new values of enthalpy, speed and height are 55 Kcal/kg, 0.30 m/s and -3 m. 2.5 Kcal/s are communicated to the system. What amount of work is done by the system: a) per kg of fluid, b) per minute, c) expressed in horsepower?arrow_forwardTwo pistons of a hydraulic lift have diameters of 60 cm and 5 cm. What is the force exerted by the larger piston when 50 N is placed on the smaller piston?arrow_forward
- 40. Water flows through a pipe of varying cross-section and varying elevation at the rate of 22.2m3/min. At one section of the pipe 3 m from the ground, the radius of the pipe is 36 cm and the pressure is 12 N/cm^2.What is the pressure at a section where the radius of the pipe is 18cm and is 0.7 m from the ground level?A. 136 123 N/m2 B. 50 N/cm2 C. 750 000 N/m2 D. 12 N/cm2arrow_forwardThe given values are D1=37 cm ; D2=12 cm ,D3=5.5 cm ,V1=2 m/sec ,V2=1.5 m/sec . i) Discharge in pipe 1 Q1=________________ m3/sec. ii) Discharge in pipe 2 Q2 = __________________ m3/sec iii) Discharge in pipe 3 Q3= _______________________ m3/sec iv) Velocity in pipe 3 V3= _________________ m/searrow_forwardPlease indicate the given, assumption and illustration. A Jet plane having a wing area of 20 m2 and weighing 25 kN flies at 950 km/hr speed. The engine develops 8,500 kW and has a mechanical efficiency of 9%. With the specific weight of air at 12 N/m3, determine the following: A) The Coefficient of Lift (CL). B) The Coefficient of Drag (CD).arrow_forward
- At temperature t= 15°C and pressure 0.98 bar, the specific volume of gas = 0.45 m³/kg. Subsequently pressure drops to P2 =0.6 bar while the temperature remains constant. Make calculation for the density of gas under the change condition.arrow_forward**Background Information: The 1 kg spherical weather balloon filled with diatomic hydrogen (H 2 ) rises adiabatically from 1000 hPa to 1 hPa, where it bursts. Its initial volume is 0.5 m^3 and the final volume is 69.47m3.arrow_forwardIf the density of liquid is 950 kg/m3, the specific volume of that liquid is a. 4.105 x10-3 m3/kg b. 1.105 x10-3 m3/kg c. 0.105 x10-3 m3/kg d. 2.105 x10-3 m3/kgarrow_forward
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