Solution for Long-answer Homework 6 Inertia and Momentum problems
Solution to Long-answer Homework Problem 6.1()
Problem:
What are the physical properties that determine an object’s inertia?
Solution
An object’s inertia (with respect to its physical characteristics) is determined by the type of material the object
is made of and the net volume of that material contained by the object.
Total Points for Problem: 1 Points
Solution to Long-answer Homework Problem 6.2( Key Concept-
Conservation
)
Problem:
Can total linear momentum ever change? Why or why not?
Solution
Although linear momentum is
always
conserved, it cannot be created or destroyed- hence the name of the law
“conservation of linear momentum,” it is only constant for an isolated system. So, you could say ”yes” depending
on the way the system is defined. However, in any case where you can account for all the changes in momentum,
they will add to zero. If you have a net change in momentum, you must realize there is something for which you
could not account. We will learn how to cope with some of these situations in later chapters.
Total Points for Problem: 2 Points
Solution to Long-answer Homework Problem 6.3()
Problem:
Another conservation law is one for the surface area of a sheet of paper: no matter how many times
it is cut, the surface area is conserved.
(a)This conservation law considers only one side of the sheet of paper and assumes that the thickness
of the paper is negligible. If you consider both sides, is the surface area still conserved?
(b)What if you consider both sides again, but also assume that the thickness of the paper is not
negligible?
Solution to Part (a)
Surface area is still conserved; simply multiply the surface area of one side of the sheet by two.

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