Concept explainers
The changes in the energy of box-Earth system and change in total energy of the system.
Answer to Problem 9PP
The change in the box-Earth system’s energy to lift the box to the table is
The change in the box-Earth system’s energy to slide the box across the table is
The change in the box-Earth system’s energy to lower the box to the floor is
The system’s total energy change is
Explanation of Solution
Given:
The mass of the box is
The height of the box from the floor is
Formula used:
The expression for the gravitational potential energy is,
Here,
Calculation:
Consider the value of acceleration due to gravity as
The change in the box-Earth system’s energy to lift the box to the table is,
The height of the reference level does not change across the table and ignore the friction. The change in the box-Earth system’s energy to slide the box across the table is,
The change in the box-Earth system’s energy to lower the box to the floor is,
The system’s total energy change is,
The system’s total energy change is
Conclusion:
Thus, the change in the box-Earth system’s energy to lift the box to the table is
Thus, the change in the box-Earth system’s energy to slide the box across the table is
Thus, the change in the box-Earth system’s energy to lower the box to the floor is
Thus, the system’s total energy change is
Chapter 11 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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