Consider the following diagram, which deals with shrimp from Galveston Bay. This diagram is technically called a/an ________ curve.
Fill in the blank(s) with the appropriate word(s).
Engel
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Where is the lowest pressure usually found in a truck cooling system?
A. top radiator tank B. bottom radiator tank C. inlet to the water manifold D. inlet to the water pump
How are S-shapes, W-shapes, and C-shapes designated on structural design and shop drawings?
What will be an ideal response?
The air resistance to 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. The air speed inside the tunnel is changed, and the drag force acting on the car is measured. For a given car, the experimental data is generally represented by a single coefficient that is called drag coefficient. It is defined by the following relationship:
The frontal area A represents the frontal projection of the car's area and could be approximated simply by multiplying 0.85 times the width and the height of a rectangle that outlines the front of a car. This is the area that you see when you view the car from a direction normal to the front grills. The 0.85 factor is used to adjust for rounded corners, open space below the bumper, and so on. To give you some idea, typical drag coefficient values for sports cars are between 0.27 to 0.38, and for sedans are between 0.34 to 0.5.
The power requirement to overcome air resistance is computed by
where
P = power (watts)
The purpose of this exercise is to see how the power requirement changes with the car speed and the air temperature. Determine the power requirement to overcome air resistance for a car that has a listed drag coefficient of 0.4 and width of 190 cm (74.4 in.) and height of 145 cm (57.4 in.). Vary the air speed in the range of 15 m/s < V < 35 m/s, and change the air density range of 1.11 kg/m^3 < p <1.29 kg/m^3. The given air density range corresponds to 0ºC to 45ºC. You may use the
ideal gas law to relate the density of the air to its temperature. Present your findings in both kilowatts and horsepower as shown in the accompanying spreadsheet. Discuss your findings in terms of power consumption as a function of speed and air temperature.
Three-dimensional computer models have replaced the making and testing of actual models or prototypes.
Answer the following statement true (T) or false (F)