FLUID MECHANICS FUNDAMENTALS+APPS
4th Edition
ISBN: 2810022150991
Author: CENGEL
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 6, Problem 72P
To determine
(a)
The engine thrust prior to insertion of thrust reverse.
To determine
(b)
The braking force required.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Consider an airplane with a jet engine attached to the tail section that expels combustion gases at a rate of 18 kg/s with a velocity of V = 300 m/s relative to the plane. During landing, a thrust reverser (which serves as a brake for the aircraft and facilitates landing on a short runway) is lowered in the path of the exhaust jet, which deflects the exhaust from rearward to 120°. Determine (a) the thrust (forward force) that the engine produces prior to the insertion of the thrust reverser and (b) the braking force produced after the thrust reverser is deployed.
Find its maximum velocity
A new design of Saturn 19 rocket with mass 1.54 x106 kg has a propulsion engine that can eject gases at a constant speed of 393.55 m/s (vGas) by burning fuel at a rate of 4.5 x10 5 kg/s (dmdT). In full tank, the rocket can carry a fuel of mass 44.42 x10 6 kg.
If this design exceeds the velocity of 11,200 m/s it can can successfully escape Earth's gravity. Determine if this is so. Find its maximum velocity (velyZ). (Pitch Angle = 0)
A jet of water with a velocity of 30 m/s impinges on a series of smooth vanes, moving with a velocity of 12 m/s,
at an angle of 30° to the direction of motion of vanes. The vane angle at outlet is 18°. Find
i. the vane angle at inlet so that the water enters without shock
ii. the absolute velocity of the water at exit, and
iii. the work done on the vanes per unit weight of water per sec entering the vanes.
Chapter 6 Solutions
FLUID MECHANICS FUNDAMENTALS+APPS
Ch. 6 - Express Newton’s second law of motion for rotating...Ch. 6 - Express Newton’s first, second, and third laws.Ch. 6 - Is momentum a vector? If so, in what direction...Ch. 6 - Express the conservation of momentum principle....Ch. 6 - How do surface forces arise in the momentum...Ch. 6 - Explain the importance of the Reynolds transport...Ch. 6 - What is the importance of the momentum-flux...Ch. 6 - Write the momentum equation for steady...Ch. 6 - In the application of the momentum equation,...Ch. 6 - Two firefighters are fighting a fire with...
Ch. 6 - A rocket in space (no friction or resistance to...Ch. 6 - Describe in terms of momentum and airflow how a...Ch. 6 - Does it take more, equal, or less power for a...Ch. 6 - In a given location, would a helicopter require...Ch. 6 - Describe body forces and surface forces, and...Ch. 6 - A constant-velocity horizontal water jet from a...Ch. 6 - A horizontal water jet of constant velocity V from...Ch. 6 - A horizontal water jet from a nozzle of constant...Ch. 6 - A 2.5-cm-diameter horizontal water jet with a...Ch. 6 - A 90 elbow in a horizontal pipe is used to direct...Ch. 6 - Repeat Prob. 6-20 for the case of another...Ch. 6 - A horizontal water jet impinges against a vertical...Ch. 6 - Water enters a 7-cm-diameter pipe steadily with a...Ch. 6 - A reducing elbow in a horizontal pipe is used to...Ch. 6 - Repeat Prob. 6-24 for the case of = 125°.Ch. 6 - A 100-ft3/s water jet is moving in the positive...Ch. 6 - Reconsider Prob. 6-26E. Using appropriate...Ch. 6 - Commercially available large wind turbines have...Ch. 6 - A fan with 24-in-diameter blades moves 2000 cfm...Ch. 6 - A 3-in-diameter horizontal jet of water, with...Ch. 6 - Firefighters are holding a nozzle at the end of a...Ch. 6 - A 5-cm-diameter horizontal jet of water with a...Ch. 6 - Prob. 33PCh. 6 - A 3-in-diameter horizontal water jet having a...Ch. 6 - An unloaded helicopter of mass 12,000 kg hovers at...Ch. 6 - Prob. 36PCh. 6 - Water is flowing through a 10-cm-diameter water...Ch. 6 - Water flowing in a horizontal 25-cm-diameter pipe...Ch. 6 - Prob. 39PCh. 6 - Water enters a centrifugal pump axially at...Ch. 6 - An incompressible fluid of density and viscosity ...Ch. 6 - Consider the curved duct of Prob. 6-41, except...Ch. 6 - As a follow-up to Prob. 6-41, it turns out that...Ch. 6 - Prob. 44PCh. 6 - The weight of a water tank open to the atmosphere...Ch. 6 - A sluice gate, which controls flow rate in a...Ch. 6 - A room is to be ventilated using a centrifugal...Ch. 6 - How is the angular momentum equation obtained from...Ch. 6 - Prob. 49CPCh. 6 - Prob. 50CPCh. 6 - Prob. 51CPCh. 6 - A large lawn sprinkler with two identical arms is...Ch. 6 - Prob. 53EPCh. 6 - The impeller of a centrifugal pump has inner and...Ch. 6 - Water is flowing through a 15-cm-diameter pipe...Ch. 6 - Prob. 56PCh. 6 - Repeat Prob. 6-56 for a water flow rate of 60 L/s.Ch. 6 - Prob. 58PCh. 6 - Water enters the impeller of a centrifugal pump...Ch. 6 - A lawn sprinkler with three identical antis is...Ch. 6 - Prob. 62PCh. 6 - The impeller of a centrifugal blower has a radius...Ch. 6 - An 8-cm-diameter horizontal water jet having a...Ch. 6 - Water flowing steadily at a rate of 0.16 m3/s is...Ch. 6 - Repeat Prob. 6-66 by taking into consideration the...Ch. 6 - A 16-cm diameter horizontal water jet with a speed...Ch. 6 - Water enters vertically and steadily at a rate of...Ch. 6 - Repeal Prob. 6-69 for the case of unequal anus-the...Ch. 6 - Prob. 71PCh. 6 - Prob. 72PCh. 6 - A spacecraft cruising in space at a constant...Ch. 6 - A 60-kg ice skater is standing on ice with ice...Ch. 6 - A 5-cm-diameter horizontal jet of water, with...Ch. 6 - Water is flowing into and discharging from a pipe...Ch. 6 - Indiana Jones needs So ascend a 10-m-high...Ch. 6 - Prob. 79EPCh. 6 - A walnut with a mass of 50 g requires a force of...Ch. 6 - Prob. 81PCh. 6 - Prob. 82PCh. 6 - A horizontal water jet of constant velocity V...Ch. 6 - Show that the force exerted by a liquid jet on a...Ch. 6 - Prob. 85PCh. 6 - Prob. 86PCh. 6 - Water enters a mixed flow pump axially at a rate...Ch. 6 - Prob. 88PCh. 6 - Water enters a two-armed lawn sprinkler along the...Ch. 6 - Prob. 91PCh. 6 - Prob. 92PCh. 6 - Prob. 93PCh. 6 - Prob. 94PCh. 6 - A water jet strikes a moving plate at velocity...Ch. 6 - Water flows at mass flow rate m through a 90°...Ch. 6 - Prob. 97PCh. 6 - Water shoots out of a Iar2e tank sitting a cart...Ch. 6 - Prob. 99PCh. 6 - Prob. 100PCh. 6 - Prob. 101PCh. 6 - Consider water flow through a horizontal, short...Ch. 6 - Consider water flow through a horizontal. short...Ch. 6 - Prob. 104PCh. 6 - Prob. 105PCh. 6 - Prob. 106PCh. 6 - The velocity of wind at a wind turbine is measured...Ch. 6 - The ve1ocity of wind at a wind turbine is measured...Ch. 6 - Prob. 109PCh. 6 - Prob. 110PCh. 6 - Prob. 111PCh. 6 - Consider the impeller of a centrifugal pump with a...Ch. 6 - Prob. 113PCh. 6 - Prob. 114P
Knowledge Booster
Learn more about
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 pump draws water from a 20 cm diam suction pipe and discharges through a 15 cm diam pipe in which the velocity is 3.60 m/s. The pressure is - 34. 465 kPa at A in the suction pipe. The 15 cm diam pipe discharges horizontally into air at C. To what height h above B can the water be raised if B is 1.8 m. above A and 20 hp is delivered to the pump? Assume that the pump operates at 80% efficiency and that the frictional loss in the pipe between A and C is 3 m.Determine the inclination angle at point C for the water stream to reach a range of 10 m. Also calculate the maximum height that the water can go from the selected datum plane.arrow_forward(b) A jet of water, having a velocity of 30 m/s impinges on a series of vanes with a velocity of 15 m/s. The jet makes an angle of 30° to the direction of motion of the vane when entering and leaves the vane at an angle of 120°. (i) Sketch the velocity diagrams at the entrance and exit (ii) Determine the vane angles so that the water enters and leaves the vane without shock. (iii) If the jet is 55mm in diameter, determine the work done for every second. (iv) What is the velocity the water as it exits the vane?arrow_forwardA fighter aircraft flies at speed of 650 m/s at an altitude of 9.0 km. It is powered by a single turbojet engine having an inlet area of 0.35 m². Assuming the exhaust speed is constant and equal to 700 m/s, the fuel to air ratio f = 0.025 and the nozzle is unchoked. Calculate: p=0.467 kg/m³ (a) The thrust force (b) Propulsive efficiencyarrow_forward
- . Indiana Jones needs to ascend a high-rise building. There is a large hose filled with pressurized water hanging down from the building top. He builds a square platform and mounts four 4-cm-diamter nozzles pointing down at each corner. By connecting hose branches, a water jet can be produced from each nozzle. Jones, the platform, and the nozzles have a combined mass of 150 kg. Determine the minimum water jet velocity needed to raise the system.arrow_forwardConsider an airplane with a jet engine attached to the tail section that expels combustion gases at a rate of 18 kg/s with a velocity of V = 300 m/s relative to the plane (Fig. 2). During landing, a thrust reverser (which serves as a brake for the aircraft and facilitates landing on a short runway) is lowered in the path of the exhaust jet, which deflects the exhaust from rearward to 1500. Determine (a) The thrust (forward force) that the engine produces prior to the insertion of the thrust reverser. (b) The braking force produced after the thrust reverser is deployed.arrow_forwardA horizontal water jet with a flow rate of V. and crosssectional area of A drives a covered cart of mass mc along a level and nearly frictionless path. The jet enters a hole at the rear of the cart and all water that enters the cart is retained, increasing the system mass. The relative velocity between the jet of constant velocity VJ and the cart of variable velocity V is VJ − V. If the cart is initially empty and stationary when the jet action is initiated, develop a relation (integral form is acceptable) for cart velocity versus time.arrow_forward
- Consider a rocket engine burning hydrogen and oxygen. The total massflow of the propellant plus oxidizer into the combustion chamber is287.2 kg/s. The combustion chamber temperature is 3600 K. Assumethat the combustion chamber is a low-velocity reservoir for the rocketengine. If the area of the rocket nozzle throat is 0.2 m2, calculate thecombustion chamber (reservoir) pressure. Assume that the gas that flowsthrough the engine has a ratio of specific heats, γ = 1.2, and a molecularweight of 16.arrow_forwardA water jet strikes a stationary horizontal plate vertically at a rate of 18 kg/s with a velocity of 20 m/s. The mass of the plate is 10 kg. Assume the water stream moves in the horizontal direction after the strike. The force needed to prevent the plate from moving vertically is (a) 186 N (b) 262 N (c) 334 N (d) 410 N (e) 522 Narrow_forwardA new design of Saturn 13 rocket with mass 1.03 x106 kg has a propulsion engine that can eject gases at a constant speed of 245.03 m/s (vGas) by burning fuel at a rate of 4.15 x10 5 kg/s (dmdT). In full tank, the rocket can carry a fuel of mass 44.46 x10 6 kg. If this design exceeds the velocity of 11,200 m/s it can can successfully escape Earth's gravity. Determine if this is so. Find its maximum velocity (velyZ). (Pitch Angle = 0)arrow_forward
- A single row impulse turbine develops 2.3 MW at a blade speed of 105 m using 52 kg of steam per second. The velocity of steam leaving the nozzle at 310 m/s. Determine the angles of nozzle and blade when the steam leaves the turbine blades at a half angle of axial direction flow while the exit whirl velocity is one-third the total whirl velocity. When a second moving and stationary rows of turbine are connected to the above single moving row with the same angles except the steam leaves the second row axially, find the specific steam consumption. (solve using the velocity diagrams)arrow_forwardA horizontal pipe has a 180 degree bend with a uniform inside diameter of 150 mm (Cross Sectional Area 0.0176 m2)and carries water. The bend lies in the horizontal plane (gravity is not relevant). The gage pressure at Station 1 is 100 kPa and 50 kPa at Station 2. The mass flowrate through the pipe is 40 kg/s, thus the average velocity is 2.26 m/s. Determine the force exerted by the fluid on the bend in the x direction. Hint: Jump straight to the momentum equation. The magnitude of the average velocity is consistent for stations 1 and 2, but the direction of the velocity is different.. 21 Flow 1 Select one: a. 4.82 kN Ob. 6.82 kNarrow_forwardIn this situation, a 90 degree elbow pipe is used to direct water flow in an upwards direction, at a rate of 40 kg/s. Here the diameter of the elbow is 10cm. The water is discharged into the atmosphere and the pressure at exit is at the local atmospheric pressure. Additionally the elevation difference between the centers of exit and inlet of the bend is 50cm. Here, the weight of the elbow pipe and the water is neglible, and the momentum-flux correction factor is 1.03 at both the oulet and inlet. How would I determine the gage pressure at the center of the inlet of the elbow? How much anchoring force would be needed to hole the elbow in place. Any help would be greatly appreciated :)arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Dynamics - Lesson 1: Introduction and Constant Acceleration Equations; Author: Jeff Hanson;https://www.youtube.com/watch?v=7aMiZ3b0Ieg;License: Standard YouTube License, CC-BY