a.
The impulse on the puck.
a.
Answer to Problem 45A
Explanation of Solution
Given:
The mass of the hockey puck,
Initial velocity of the puck with which it strikes the net,
Final velocity of the puck after it bounces off,
Formula used:
Momentum of an object of mass m and moving with velocity v is given by,
Impulse on an object is equal to the change in momentum of an object,
where
Calculation:
Assume the initial direction of motion of the puck be positive, then the opposite direction will be negative. Then, the velocities will be,
Using the given values, the impulse on the puck will be,
Conclusion:
Thus, the impulse on the puck is
b.
The average force on the puck if the collision takes
b.
Answer to Problem 45A
Explanation of Solution
Given:
The mass of the hockey puck,
Initial velocity of the puck with which it strikes the net,
Final velocity of the puck after it bounces off,
From part (a), the impulse on the puck is
Time taken for the collision,
Formula used:
Impulse on an object is equal to the change in momentum of an object,
where
Calculation:
Assume the initial direction of motion of the puck be positive, then the opposite direction will be negative.
Then the average force on the puck will be,
Using all the given values in above,
Conclusion:
Thus, the average force on the puck is
.
Chapter 9 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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