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 17.25PP
To determine
The power required to overcome drag
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13.94. A body travels through 60° standard air at 60 mph, and 5.5 hp is required to maintain this speed. If the
projected area is 13.5 ft2
, find the drag coefficient.
Ans. 0.28
Name some applications in which a large drag is desired.
Solve Parts A-C and label Them
QUESTION: Suppose you buy a 3 x 7-ft sheet of plywood and put it on your roof rack. You drive home at 45 mi/h.
Part A - If the board is perfectly aligned with the airflow, how thick is the boundary layer at the end of the board?
Part B - Estimate the drag on the sheet of plywood if the boundary layer remains laminar?
Part C - Estimate the drag on the sheet of plywood if the boundary layer is turbulent (assume the wood is smooth) and compare the result to that of the laminar boundary layer case.
HINT - 3 X 7-ft sheet of plywood and put it on your roof rack. You drive home at 45 mi/h.
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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- Kindly give me both right solutions with clear calculations The drag polar of a glider is given by CD=0.01+0.022CL2 . If it is launched from a height of 400m in still air. Please determine:(a) the maximum lift to drag ratio ??;(b) the greatest possible ground distance it can cover.arrow_forwardA truck having projected area of 6.5 m² and travelling at 72 km/h has a total resistance of 1.6 kN. Out of this resistance, 30% is due to rolling, 20% due to surface friction and rest is due to drag. Calculate the coefficient of drag if specific weight of air is 12 N/m^3.arrow_forwardA small aircraft has a wing area of 37 m2, a lift coefficient of 0.45 at takeoff settings, and a total mass of 4300 kg. Determine the following: The takeoff speed of this aircraft at sea level at standard atmospheric conditions The wing loading The required power to maintain a constant cruising speed of 300 km/h for a cruising drag coefficient of 0.036arrow_forward
- Describe the downwash angle of a finite span wing and induced drag coefficient!arrow_forwardAlight aircraft with a wing area of 114 m^2 and a span of 29 m is flying at an altitude of 3,550 m when the engine suddenly fails. If the parasite drag coefficient is 0.0325, determine the maximum distance over the ground that the aircraft can cover. Assume elliptical lift distribution. Provide answer in km, nearest hundredths.arrow_forwardThe wing loading on an airplane is defined as the aircraft weight divided by the wing area. An airplane is cruising with a wing loading of 2500 Pa. The lift coefficient and drag coefficient are 0.30 and 0.06, respectively. Calculate the drag force if the wing planform area is 12 m2. Assume that the air density is unknown and not given.arrow_forward
- A sign is exposed to a 15 m/s wind on a standard day. Estimate the drag on the sign if(a) the sign is aligned lengthwise to the wind.(b) the sign is crosswise to the wind (wind perpendicular to the face of the sign).arrow_forwardA flat plate of 10ft span and 6 ft chord is placed in an airstream of 100mph under SSLC. If the transition Reynold's number is 10^6, calculate the Total Skin Friction Drag in lbs.arrow_forwardA 17,000-kg tractor-trailer rig has a frontal area of 9.2 m2, a drag coefficient of 0.96, a rolling resistance coefficient of 0.05 (multiplying the weight of a vehicle by the rolling resistance coefficient gives the rolling resistance), a bearing friction resistance of 350 N, and a maximum speed of 110 km/h on a level road during steady cruising in calm weather with an air density of 1.25 kg/m3. Now a fairing is installed to the front of the rig to suppress separation and to streamline the flow to the top surface, and the drag coefficient is reduced to 0.76. Determine the maximum speed of the rig with the fairing.arrow_forward
- Answer correctly. Here is the Translation. "A luxury sports car has an area of 2 m² and there is a drag coefficient of 0.29 at a speed of 90 km/h. Calculate the drag force exerted on the car at this speed"arrow_forwardA small, fast boat has a specific resistance ratio of 0.06 (see Table 17.2) and displaces 125 long tons. Compute the total ship resistance and the power required to overcome drag when it is moving at 50 ft/s in seawater at 77°F.arrow_forwardBill gets a job delivering pizzas. The pizza company makes him mount a sign on the roof of his car. The frontal area of the sign is A = 0.612 ft2, and he estimates the drag coefficient to be CD = 0.94 at nearly all air speeds. Estimate how much additional money it costs Bill per year in fuel to drive with the sign on his roof compared to without the sign. Use the following additional information: He drives about 10,000 miles per year at an average speed of 45 mph. The overall car efficiency is 0.332, ? fuel = 50.2 lbm/ft3, and the heating value of the fuel is 1.53 × 107 ft . lbf/lbm. The fuel costs $3.50 per gallon. Use standard air properties. Be careful with unit conversions.arrow_forward
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