To reduce the drag coefficient and thus to improve the fuel efficiency of cars, the design of side rearview mirrors has changed drastically in recent decades from a simple circular plate to a streamlined shape. Determine the amount of fuel and money saved per year as a result of replacing a 13-cm-diameter flat mirror by one with a hemispherical back, as shown in the figure. Assume the car is driven 24,000 km a year at an average speed of 95 km/h. Take the density and price of gasoline to be 0.75 kg/L and $0.90/L, respectively; the heating value of gasoline to be 44,000 kJ/kg; and the overall efficiency of the engine to be 30 percent.

To reduce the drag coefficient and thus to improve the fuel efficiency of cars, the design of side rearview mirrors has changed drastically in recent decades from a simple circular plate to a streamlined shape. Determine the amount of fuel and money saved per year as a result of replacing a 13-cm-diameter flat mirror by one with a hemispherical back, as shown in the figure. Assume the car is driven 24,000 km a year at an average speed of 95 km/h. Take the density and price of gasoline to be 0.75 kg/L and $0.90/L, respectively; the heating value of gasoline to be 44,000 kJ/kg; and the overall efficiency of the engine to be 30 percent.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter13: Energy And Power

Section: Chapter Questions

Problem 2P

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Question

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To reduce the drag coefficient and thus to improve
the fuel efficiency of cars, the design of side rearview mirrors
has changed drastically in recent decades from a simple
circular plate to a streamlined shape. Determine the amount
of fuel and money saved per year as a result of replacing a
13-cm-diameter flat mirror by one with a hemispherical back,
as shown in the figure. Assume the car is driven 24,000 km
a year at an average speed of 95 km/h. Take the density and
price of gasoline to be 0.75 kg/L and $0.90/L, respectively;
the heating value of gasoline to be 44,000 kJ/kg; and the
overall efficiency of the engine to be 30 percent.

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