Concept explainers
(a)
The friction force exerted by the road.
(a)
Answer to Problem 40P
The friction force exerted by the road is
Explanation of Solution
Write the expression for drag force on the car.
Here,
Frictional force and drag force are opposite in direction.
Using Newton’s second law, write the expression for net force in the horizontal direction.
Here,
Solve equation (III) for
Use equation (I) in (II).
Conclusion:
Substitute,
Substitute,
Therefore, the friction force exerted by the road is
(b)
The acceleration of the car if drag coefficient is
(b)
Answer to Problem 40P
The acceleration of the car if drag coefficient is
Explanation of Solution
Conclusion:
Substitute,
Therefore, the acceleration of the car is
(c)
The possible maximum speed pf the car at
(c)
Answer to Problem 40P
The possible maximum speed pf the car at
Explanation of Solution
At the maximum speed, the net force along the horizontal direction is zero.
Conclusion:
Substitute,
Therefore, The possible maximum speed pf the car at
(d)
The possible maximum speed pf the car at
(d)
Answer to Problem 40P
The possible maximum speed pf the car at
Explanation of Solution
Conclusion:
Substitute,
The drag reduction significantly affects maximum speed.
Therefore, the possible maximum speed pf the car at
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Chapter 5 Solutions
Principles of Physics: A Calculus-Based Text
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- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning