Engineering Fundamentals: An Introduction to Engineering
Engineering Fundamentals: An Introduction to Engineering
6th Edition
ISBN: 9780357112311
Author: Saeed Moaveni
Publisher: Cengage Learning US
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Chapter 7, Problem 21P
To determine

Determine the frontal area of the car.

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The air resistance to the motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. For a given car, the experimental data is generally represented by a single coefficient that is called the drag coefficient. It is given by the relationship: Fa C, = where C, = drag coefficient F, = measured drag force (Ib) p = air density (slugs/ft') V = air speed inside the wind tunnel (ft/s) A = frontal area of the car (ft²) What is the appropriate unit for C, if the preceding equation is to be homogeneous in units? Show all steps of your work.
3. The drag force of an object moving through a fluid is found to be FD = CpAv² where Cis the drag coefficient, A is the area of the object facing the fluid, and p is the density of the fluid. The drag coefficient is determined experimentally. Using this form of the drag force, calculate the terminal velocity of a 75 kg skydiver in 2 positions: diving head first like an arrow (C=0.70, A=0.18 m²) and laying horizontal (C=1.0, A=2 m²). The density of air is p = 1.21 kg/m³.
DYNAMICS OF RIGID BODIES Two masses of 14 kg and 7 kg connected by a flexible inextensible cord rest on a smooth plane inclined 45° with the horizontal as shown in the figure. When the masses are released, what will be the tension T in the cord? Assume the coefficient of friction between the plane and the 14-kg mass is 1/4 and between the plane and the 7-kg mass is 3/8? 7 kg 14 kg 450
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