(a)
The impulse needed to stop the child.
(a)
Answer to Problem 58A
Explanation of Solution
Given:
Initial velocity of the car and the child is
The car crashes in to a barrier and stops in time,
Since the child is in the car, time period for the child is also
Mass of the child is
Final velocity of the car and the child is
Formula used:
Impulse experienced by a body must be the change in momentum of that body. This is given by the expression,
Where,
Substituting for
Calculation:
Substituting the numerical values in equation
Conclusion:
The impulse needed to stop the child is
(b)
The average force on the child.
(b)
Answer to Problem 58A
Explanation of Solution
Given:
Initial velocity of the car and the child is
The car crashes in to a barrier and stops in time
Since the child is in the car, time period for the child is also
Mass of the child is
Final velocity of the car and the child is
Formula used:
From the equation
Calculation:
Substituting the numerical values in equation
Conclusion:
The average force on the child is
(c)
The approximate mass of an object whose weight equals the force in part b.
(c)
Answer to Problem 58A
Explanation of Solution
Given:
Force,
Formula used:
Force
For weight calculation, acceleration
Hence the equation can be written as,
Calculation:
Substituting the numerical values in equation
Conclusion:
The approximate mass of an object whose weight equals the force in part b is
(d)
Whether a person can lift a weight obtained in part c with his arm.
(d)
Answer to Problem 58A
No
Explanation of Solution
The approximate mass of an object obtained in the part c is
(e)
To Explain: It is advisable to use a proper restraining seat rather than hold a child on person’s lap.
(e)
Answer to Problem 58A
Because it is difficult to protect a child during an accident.
Explanation of Solution
Introduction:
People hold their children in their lap while travelling by vehicle. But it is not the safe way of travelling with children. Nowadays, a specially designed seat called child restraint seat or baby seat are available to protect children from getting injury or death during an accident. Child restraint seat offers passive restraint and it is very essential to use it properly to be effective.
A person will not be able to protect a child on his lap during an accident. Hence it is better to use a proper restraining seat rather than hold a child on person’s lap.
Chapter 9 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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