Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
Chapter 13, Problem 40A
If you were unfortunate enough to be in a freely falling elevator; you might notice the bag of groceries you were carrying hovering in front of you, apparently weightless. Cite the frames of reference in which the groceries would be falling, and those in which they would not be falling.
Expert Solution & Answer
To determine
The frame of reference in which the groceries would be falling and not falling.
Answer to Problem 40A
Groceries will be falling with Earth and not falling with the falling elevator.
Explanation of Solution
Introduction:
Weightlessness is the condition of the absence of support force or when the net forces exerted on the object is zero.
When a person is in a free-falling elevator, then groceries with the person hover in front of him. This is because of weightlessness acting on the groceries. Groceries will experience force with Earth i.e. combined system of groceries and the elevator will fall downwards.
But, it will not fall with the elevator that is net supporting forces experienced on the groceries will be zero. As the elevator free falling downwards, it will experience downwards force. But, the mass above the elevator will balance each other. Thus, groceries will not fall with the elevator.
Conclusion:
Thus, groceries will be falling with Earth and not falling with the falling elevator.
Chapter 13 Solutions
Conceptual Physics: The High School Physics Program
Ch. 13 - In Newtons insight, what did a falling apple have...Ch. 13 - In what sense does the moon 'fall'?Ch. 13 - How does the tangential velocity of a planet...Ch. 13 - What is the gravitational force between two...Ch. 13 - Prob. 5ACh. 13 - In what way does the force of gravity between two...Ch. 13 - How does the force of gravity depend on the...Ch. 13 - How does the force of gravity between two bodies...Ch. 13 - How does the intensity of light, radiation, and...Ch. 13 - Do you escape from Earths gravity if you're above...
Ch. 13 - At what distance away from Earth is Earths...Ch. 13 - Prob. 12ACh. 13 - What is the value of Earths gravitational field at...Ch. 13 - If you stepped into a hole that passed completely...Ch. 13 - Would the gauge inside a bathroom scale be more...Ch. 13 - Do tides depend more on the strength of...Ch. 13 - Why are ocean tides higher at the time of a full...Ch. 13 - Prob. 18ACh. 13 - Prob. 19ACh. 13 - What was the cause of perturbations discovered in...Ch. 13 - The planet and its moon gravitationally attract...Ch. 13 - Calculate the force of gravity on a 1-kg mass at...Ch. 13 - Calculate the force of gravity on the same 1-kg...Ch. 13 - Calculate the force of gravity between Earth...Ch. 13 - Calculate the force of gravity between Earth and...Ch. 13 - Calculate the force of gravity between a newborn...Ch. 13 - Calculate the force of gravity between a newborn...Ch. 13 - Comment on whether or not this label on a consumer...Ch. 13 - Gravitational force acts on all objects in...Ch. 13 - Irene says that Earths force of gravity is...Ch. 13 - Stephan says that the force of gravity is stronger...Ch. 13 - Earth and the moon are gravitationally attracted...Ch. 13 - What is the magnitude and direction of the...Ch. 13 - If the gravitational forces of the sun on the...Ch. 13 - The moon 'falls' 1.4 mm each second. Does this...Ch. 13 - If the moon were twice as massive, would the...Ch. 13 - The weight of an apple near the surface of Earth...Ch. 13 - A friend proposes an idea for launching space...Ch. 13 - If you stand on a shrinking planet, so that in...Ch. 13 - If you were unfortunate enough to be in a freely...Ch. 13 - What two forces act on you in a moving elevator?...Ch. 13 - A friend says that astronauts in orbit are...Ch. 13 - The sun exerts almost 200 times more force on the...Ch. 13 - From a point of view at the sun, does the moon...Ch. 13 - What would be the effect on Earths tides if the...Ch. 13 - Whenever the ocean tide is unusually high, will...Ch. 13 - The human body is more than 50% water. Is it...Ch. 13 - A black hole is no more massive than the star from...Ch. 13 - Which requires more fuel—a rocket going from...Ch. 13 - Prob. 50ACh. 13 - The planet Jupiter is about 300 times as massive...Ch. 13 - Some people dismiss the validity of scientific...Ch. 13 - Equate your weight mg to Newtons equation for...Ch. 13 - Isabella drops a chunk of iron of mass m from the...Ch. 13 - The symbol g can mean acceleration due to gravity...Ch. 13 - By what factor would your weight change if the...Ch. 13 - Find the change in the force of gravity between...Ch. 13 - If you stood atop a ladder that was so tall that...Ch. 13 - Suppose you stood atop a ladder that was so tall...Ch. 13 - Prob. 60ACh. 13 - By what factor does the force of gravity between...Ch. 13 - By what factor does the force of gravity between...Ch. 13 - By what factor does the force of gravity between...Ch. 13 - Many people mistakenly believe that the astronauts...
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