3) An advertising sign mounted on the roof of a car is 33 inches tall, 15 inches wide and 54 inches long (airflow direction). The underside of the sign is flush with the top surface of the roof. Take air properties be: p = 0.075 lbm/ft' and u = 1.22x10 Ibm/ft.sec. Used a pressure drag coefficient of 1.2 for the advertisement sign. Calculate the total drag on the sign and the power required to overcome its effect if th car is travelling at a constant speed of a) 12 mph and b) 45 mph.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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3) An advertising sign mounted on the roof of a car is 33 inches tall, 15 inches wide and 54 inches long
(airflow direction). The underside of the sign is flush with the top surface of the roof. Take air properties to
be: p = 0.075 lbm/ft' and u= 1.22x10 lbm/ft.sec. Used a pressure drag coefficient of 1.2 for the
advertisement sign. Calculate the total drag on the sign and the power required to overcome its effect if the
car is travelling at a constant speed of a) 12 mph and b) 45 mph.
Note: Provide a schematic diagram (sketch) of the problem configuration (if applicable). Every numerical
calculation must be preceded by the appropriate equation. Do not forget units & dimensions during
your calculations.
Transcribed Image Text:3) An advertising sign mounted on the roof of a car is 33 inches tall, 15 inches wide and 54 inches long (airflow direction). The underside of the sign is flush with the top surface of the roof. Take air properties to be: p = 0.075 lbm/ft' and u= 1.22x10 lbm/ft.sec. Used a pressure drag coefficient of 1.2 for the advertisement sign. Calculate the total drag on the sign and the power required to overcome its effect if the car is travelling at a constant speed of a) 12 mph and b) 45 mph. Note: Provide a schematic diagram (sketch) of the problem configuration (if applicable). Every numerical calculation must be preceded by the appropriate equation. Do not forget units & dimensions during your calculations.
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