College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 6, Problem 23CQ
In what frame(s) of reference are Kepler's laws valid? Are Kepler's laws purely descriptive, or do they contain causal information?
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Apply: Suppose an elephant has a mass of 1,800 kg and a person has a mass of 75 kg. If the strength of
gravitational force on the person was 735 N, what would be the gravitational force on the elephant?
Assume both the person and elephant are on Earth's surface.)
I Since force and mass are proportional, set this up as a proportion/ratio.
(mass of elephant)
(mass of human)
(force on elephant)
(force on human)
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Answer:
You may have an image of Sir Isaac Newton sitting under a tree and after being hit on the head by an apple he suddenly "discovered" the Law of Universal Gravitation. In fact, the theory was a result of years’ worth of research, which in turn was based on centuries of accumulated knowledge. He is credited with determining that the following relationship is universal. The gravitational attraction between two objects varies jointly with their masses (m1 and m2) and inversely with the square of the distance (d) between them. By what percent does the force of gravitational attraction change if one mass is increased by 20%, the other mass decreased by 20%, and the separation is reduced by 25%?
Three masses, MA = Mg = Mc = M are placed at the vertices
of a right triangle ( ill slE ¿ilia wg'} ) de), as shown in the
figure below. The distance between Ma and M, is similar
to that between Mc and Mg and is equal to R. The
magnitude of the net gravitational force exerted on Mg is
given by:
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MA
A. 1.41 (GM/R)
B. 1.41 (GM/R?)
C. 1.41 (GM²/R?)
D. 1.41 (G?M/R?)
1.41 (G?M?/R?)
R
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Chapter 6 Solutions
College Physics
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