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# Bill gets a job delivering pizzas. The pizza company makes him mount a sign on the roof

ISBN: 9780073380322 410

## Solution for problem 11-28 Chapter 11

Fluid Mechanics Fundamentals and Applications | 3rd Edition

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Problem 11-28

Bill 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 5 0.612 ft2, and he estimates the drag coefficient to be CD 5 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, rfuel 5 50.2 lbm/ft3, and the heating value of the fuel is 1.53 3 107 ft . lbf/lbm. The fuel costs \$3.50 per gallon. Use standard air properties. Be careful with unit conversions.

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BIT 323 CAT-DATA ANALYSIS TECHNIQUES SIT/0006/10 Assignment 1 Types of Hypotheses There are two types of hypotheses: i. Research hypothesis ii. Null hypothesis. Research hypothesis It is the hypothesis derived from the researcherâ€™s theory about some social phenomenon. Researchers always believe that their research hypotheses are accurate statements about the condition...

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