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Engineering and Tech / Fundamentals of Thermodynamcs 8 / Chapter 3 / Problem 197HP

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

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A drag force on a car, with frontal area A = 2 m2, driving

Chapter 3, Problem 197HP

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QUESTION:

Problem 197HP

A drag force on a car, with frontal area A = 2 m2, driving at 80 km/h in air at 20°C, is Fd = 0.225 A ρairV2. How much power is needed, and what is the traction force?

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QUESTION:

Problem 197HP

A drag force on a car, with frontal area A = 2 m2, driving at 80 km/h in air at 20°C, is Fd = 0.225 A ρairV2. How much power is needed, and what is the traction force?

ANSWER:

Solution 197 HP

Step 1 of 4:

In this question, we need to find power needed and also find the traction force

Data given

Frontal area of area $A=2\ {m}^{2}$

Velocity of car $V=80\ km/h$

Converting to $m/s$ $V=80\ km/h\times{}\frac{1000\ m}{3600\ s}$

$V=22.22\ m/s$

Temperature $T=2{0}^{0}C=293\ K$

Displacement force ${F}_{d}=0.225\ A$

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