Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 5, Problem 18RQ
To determine
The reason why Newton concluded that gravity has to be mutual and universal.
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Are Kepler’s laws purely descriptive, or do they contain causal information? Why?
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%?
According to Newton, two objects attracted by gravity actually both orbit around their common center of mass. That means:
a
the Sun is not orbiting because it's too big and too massive compared with Earth
b
the Sun is not orbiting because it's too far from Earth
c
the Sun is not orbiting because stars do not orbit
d
the Sun is orbiting but we can't clearly see it because it's too big and too massive compared with Earth
Chapter 5 Solutions
Stars and Galaxies
Ch. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Prob. 3RQCh. 5 - Prob. 4RQCh. 5 - Prob. 5RQCh. 5 - Prob. 6RQCh. 5 - Prob. 7RQCh. 5 - Prob. 8RQCh. 5 - Prob. 9RQCh. 5 - Prob. 10RQ
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Ch. 5 - Prob. 35RQCh. 5 - Prob. 36RQCh. 5 - Prob. 37RQCh. 5 - Prob. 38RQCh. 5 - Prob. 39RQCh. 5 - Prob. 40RQCh. 5 - Prob. 41RQCh. 5 - Prob. 42RQCh. 5 - An astronomy textbook is to be dropped from a tall...Ch. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8PCh. 5 - Prob. 9PCh. 5 - Describe the shape of the orbit followed by the...Ch. 5 - Prob. 13PCh. 5 - Prob. 14PCh. 5 - A moon of Jupiter takes 1.8 days to orbit at a...Ch. 5 - Prob. 1LLCh. 5 - Prob. 2LLCh. 5 - Prob. 3LL
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Why would Aristotles explanation of gravity not work if Earth is not the center of the Universe?arrow_forwardAre Kepler’s laws purely descriptive, or do they contain causal information?arrow_forwardAccording to Keplers first law, planets move in elliptical orbits. Why is that considered accelerated motion? According to Newton, what is the force causing that acceleration?arrow_forward
- Compare the gravitational attraction between objects on earth and interaction of celestial bodies in space. Which gravitational force is almost negligible? Why? Discuss why the study of a gravitational field is important.arrow_forwardWhat if there is no gravity on earth?arrow_forwardThe Universal Law of Gravity states that the force of gravity acts between all objects. Nonetheless, you never feel that the fridge in your kitchen pulls you toward it. Why?arrow_forward
- According to Newton's Law of Gravity, if you triple the distance between two objects, then the gravitational force between them will go (up or down)? by a factor of (six,three,two or nine)?arrow_forwardNewton tells us that gravitational force acts on all bodies in proportion to their masses. Why, then, doesn’t a heavy body fall faster than a light body?arrow_forwardIf you were on an alien planet, where multiple sources of gravity were affecting you, would the stronger gravity take precedence or would they cancel one another out? And why?arrow_forward
- Newton viewed the curving of the path of a planet as being caused by a force acting upon the planet. How did Einstein view the curved path of a planet?arrow_forwardWhy, if the sun is so much more massive than the moon, isn’t it responsible for the Tides? Use Universal Law of Gravitation to explain.arrow_forward
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