(a)
The change in momentum, or equivalently, the magnitude and the direction of the impulse on the car.
(a)
Answer to Problem 2PP
The magnitude of the impulse is
Explanation of Solution
Given:
The average force exerted on the car to slow it downis
The driver applies the brakes hard for,
Figure 1
Formula used:
Impulse is equal to the force
Calculation:
Substituting the numerical values in equation
Conclusion:
The magnitude of the impulse is
(b)
To complete the “before” and “after” sketches, and to determine the momentum and the velocity of the car now.
(b)
Answer to Problem 2PP
Explanation of Solution
Given:
The mass of the compact car is
The initial velocity of the car is
Formula used:
Momentum of a car can be calculated by using the equation,
Where,
From equation
Where,
Final momentum of the car can be calculated using the equation,
Where,
Where,
Calculation:
Sketches of “before” and ‘after” the brake is applied on the car is as shown in figure
Figure
Figure
Initial momentum of the car is calculated by substituting the numerical values in equation
Substituting the values of impulse from part (a) and initial momentum in equation
Final velocity of the car is calculated by substituting the value of final momentum and mass of the car in equation
Conclusion:
Initial momentum of the car is
Final momentum of the car is
Final velocity of the car is
Chapter 9 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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