Concept explainers
(a)
The work done by hoisting the sack of grain in to the storage room.
(a)
Answer to Problem 63A
Explanation of Solution
Given:
Weight of the sack of grain is
Height of the storage room above the ground floor of a grain elevator is
Formula used:
Work done by hoisting the sack of grain in to the storage room can be calculated using the equation,
Calculation:
Substituting the numerical values in equation
Conclusion:
The work done by hoisting the sack of grain in to the storage room is
(b)
The increase in potential energy of a system containing the sack of grain and Earth.
(b)
Answer to Problem 63A
Explanation of Solution
Given:
Weight of the sack of grain is
Height of the storage room above the ground floor of a grain elevator is
Formula used:
The increase in potential energy of a system containing the sack of grain and Earth can be calculated using the equation,
Where,
and
Substituting these values in equation
Calculation:
Substituting the numerical values in equation
Conclusion:
The increase in potential energy of a system containing the sack of grain and Earth is
(c)
The kinetic energy of the sack of grain just before it strikes the ground floor.
(c)
Answer to Problem 63A
Explanation of Solution
Given:
Weight of the sack of grain is
Height of the storage room above the ground floor of a grain elevator is
Formula used:
Kinetic energy of a system is
Calculation:
When an object is at rest at a height from the ground, it possesses some potential energy but its kinetic energy is zero. If it falls from the height to the ground, it will lose its potential energy and converted into kinetic energy.
Therefore, the kinetic energy of the sack of grain just before striking the ground floor is equal to the potential energy of the sack of grain at height
So, the kinetic energy of the sack of grain just before it strikes the ground floor is,
Conclusion:
The kinetic energy of the sack of grain is
Chapter 11 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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