Concept explainers
(a)
The average force exerted on the person.
(a)
Answer to Problem 5PP
Explanation of Solution
Given:
Mass of the person is
Initial velocity of the car (and that of the person) is
Final velocity of the car (and that of the person) is
Time interval at which velocity of the car undergoes change is
Formula used:
In order to find the average force exerted on the person let us use the relationship between the impulse and change in momentum. Impulse experienced by an object must be the change in momentum of that object. This is given by the expression,
Where,
Substituting for
Calculation:
Substituting the numerical values in equation
OR
Conclusion:
The average force exerted on the person is
(b)
The mass of an object that has a weight equal to the force calculated in the part (a), whether this mass can be able to lift that weight by a person, and whether a person is strong enough to stop his body with his arms.
(b)
Answer to Problem 5PP
Explanation of Solution
Given:
Mass of the person is
The average force
Formula used:
Force
For weight calculation, acceleration
Hence the equation can be written as,
Calculation:
Substituting the numerical values in equation
Conclusion:
The mass of an object that has a weight equal to the force calculated in the part (a) is
Chapter 9 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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