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Concept explainers
(a)
The drag racer time and the minimum coefficient of static friction between the tires and the road.
(a)
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Answer to Problem 75P
The drag racer time is
Explanation of Solution
Write the expression for acceleration of the drag racer from
Here,
Rewrite the above expression for acceleration.
Write the expression for drag racer time from kinematic equation.
Here,
Rewrite the above expression for time.
Write the expression for frictional force.
Here,
Write the expression for horizontal force exerted on the racer.
Here,
Compare the above relation (III) and (IV) to find the coefficient of static friction.
Conclusion:
Substitute
Substitute
Substitute
Thus, the drag racer time is
(b)
The time taken to finish the race.
(b)
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Answer to Problem 75P
The time taken to finish the race is
Explanation of Solution
If the acceleration is reduced to 30% because of the bad tires or wet pavement, the new acceleration of the drag racer is,
Here,
The net acceleration of the racer is,
Write the expression for the time taken to finish the race.
Here,
Conclusion:
Substitute
Substitute
Substitute
Thus, the time taken to finish the race is
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Chapter 4 Solutions
COLLEGE PHYSICS-CONNECT ACCESS
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