Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 6, Problem 4Q
To determine

The description of a refracting telescope with the help of a diagram. Mention the dimension of the telescope which determines light gathering power and magnification.

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As a box is lifted against gravity and placed on a shelf, how does the work done by the lifter compare with the work done by gravity?  What is the net work done on the box?  What does this imply about its change in kinetic energy?  Use definitions and mathematics from this chapter to answer these questions.
As I carry a box up a flight of stairs, am I doing positive work or negative work on the box? Provide a mathematical explanation.
As a ball falls under the influence of gravity, does gravity do positive work or negative work? Provide a mathematical explanation.
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