Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 17, Problem 17.6PP
A parachute in the form of a hemispherical cup
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For a new sailboat, a designer wants to determine the drag force that may be expected at a given speed. To do so, she places a model of the proposed hull in a test channel and uses three cables to keep its bow on the centerline of the channel. Dynamometer readings indicate that for a given speed, the tension is 40 lb in cable AB and 60 lb in cable AE. Determine the drag force exerted on the hull and the tension in cable AC.
A 1:8 scale tractor model is tested in a pressurized wind tunnel. The width, height and length of the model are 0.305 m; 0.476 m; and 2.48 m. In the test with a wind speed of 75 m/s, the drag force that occurs in the model is 128 N. Determine the aerodynamic drag and the power that the engine must give to the prototype tractor vehicle when running at a speed of 50 km/hour where the wind blows from the front of the tractor at a speed of 10 km/hour.
An amusement park is designing a new ride. The ride is to have a motorized horizontal launch section that is 5m long. For safety the ride cars will be limited to ⅓g worth of acceleration and will have a typical loaded mass of 400kg. What is the maximum launch velocity of this situation, and what engine power rating is necessary to achieve this velocity?
Chapter 17 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 17 - A cylinder 25 mm in diameter is placed...Ch. 17 - As part of an advertising sign on the top of a...Ch. 17 - Determine the terminal velocity (see Section 2.6.4...Ch. 17 - Calculate the moment at the base of a flagpole...Ch. 17 - A pitcher throws a baseball without spin with a...Ch. 17 - A parachute in the form of a hemispherical cup 1.5...Ch. 17 - Calculate the required diameter of a parachute in...Ch. 17 - A ship tows an instrument in the form of a 30...Ch. 17 - A highway sign is being designed to withstand...Ch. 17 - Assuming that a semitrailer behaves as a square...
Ch. 17 - A type of level indicator incorporates four...Ch. 17 - Prob. 17.12PPCh. 17 - A bulk liquid transport truck incorporates a...Ch. 17 - A wing on a race car is supported by two...Ch. 17 - Prob. 17.15PPCh. 17 - The four designs shown in Fig. 17.16 for the cross...Ch. 17 - Prob. 17.17PPCh. 17 - Prob. 17.18PPCh. 17 - An antenna in the shape of a cylindrical rod...Ch. 17 - Prob. 17.20PPCh. 17 - Prob. 17.21PPCh. 17 - Prob. 17.22PPCh. 17 - Assume that curve 2 in Fig. 17.5 is a true...Ch. 17 - Prob. 17.24PPCh. 17 - Prob. 17.25PPCh. 17 - A small, fast boat has a specific resistance ratio...Ch. 17 - Prob. 17.27PPCh. 17 - Assume that Fig. 17.11 shows the performance of...Ch. 17 - Calculate the total drag on an airfoil that has a...Ch. 17 - Prob. 17.30PPCh. 17 - Prob. 17.31PPCh. 17 - Prob. 17.32PPCh. 17 - Prob. 17.33PP
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- Two spherical marbles are released from rest in a viscous fluid.The marbles are made of the same material but the radius of marble 2 is two times larger than the radius of marble 1.The density of the marbles is greater than the density of the fluid.Which one of the following statements is correct? At a particular speed, the resistive drag force of the fluid on marble 2 is twice the force on marble 1. The magnitude of the buoyant force on marble 2 is equal to the magnitude of the buoyant force on marble 1. The resistive drag force of the fluid on a marble decreases as the speed of the marble increases. The resistive drag force of the fluid on a marble is constant until the marble reaches its terminal speed. The magnitude of the buoyant force on a marble equals the magnitude of its weight.arrow_forwardA non spinning ball having a mass of 3.5 oz is thrown vertically upward with a velocity of 100 mph and has zero velocity at a height of 210 ft above the release point. Assume that the air drag on the ball is constant and find this constant average" air drag. Neglect the buoyant force of air on the ball.arrow_forwardA lady on a bicycle is going down a hill. If the initial slope angle θ1 = 5 and she has a constant speed with no braking or pedaling, determine the drag force asserted on bicycle tires by the ground (Assume the total mass for her and the bicycle is 70 kg and neglect air resistance). Question 2 options: F=35.93 N F=0.0483g N F=59.85 N F=0.0523mg N Note:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.arrow_forward
- A 50 kg inclined plane, 4 m long and 30 degrees in angle, rests without friction on a table (there is oil between the inclined plane and the table). A 20 kg mass is at the top of the inclined plane and slides without friction on it. How much will the inclined plane move when the mass reaches the table? What will be the speed of the inclined plane and the speed of the mass when the latter is on the table? (we have conservation of mechanical energy (no friction) and conservation of momentum...)arrow_forwardA baseball catcher stops a 84 mph fastball over a distance of 0.15 m. What is the force necessary to stop the 0.14 kg baseball? (Express your answer using three significant figures.) F = Narrow_forwardThe drag force acting on a 60 kg skydiver in the "spread" position shown can be approximated by Fo = 0.0436v², where Fo is in newtons and v is in m per second (from Scientific and Engineering Problem-Solving with the Computer, W.R. Bennett, Jr., Prentice Hall, New York, 1976). If the skydiver follows a vertical path, determine the terminal velocity.arrow_forward
- drag is 125 kN and the flight path angle is 6°. Determine the angle of attack and the thrust required to maintain a steady flight. Infer the effect of thrust on the aero plane's weight.arrow_forwardQ3 2 m 8 m 2 m 5000 kg wind speed 0.75 m Determine the required wind speed in order lift one side of the tire off the ground / topple the truck. Density of air is 1.184 kg/m3arrow_forwardA bicycle and rider of mass 120 kg are travelling at a speed of 15 km/hr on a level road. The rider applies brake to the rear wheel which is 0.9 m diameter. How far the bicycle will travel before it comes to rest ? The pressure applied to the brake is 100 N and u = 0.05. Assume that no other resistance is acting on bicycle. Also find number of revolutions made by bicycle before coming to rest.arrow_forward
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