Life in the Universe (4th Edition)
4th Edition
ISBN: 9780134089089
Author: Jeffrey O. Bennett, Seth Shostak
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 34TYU
Galileo’s contributions to astronomy included (a) discovering the laws of planetary motion; (b) discovering the law of gravity; (c) making observations and
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Using newton's law of gravitation. The Kepler's third law of planetary motion.
1. Which statement regarding scientific models is true?
(a) Models that do not make new predictions are wrong.
(b) There can only be one model that explains a set of observations.
(c) We design experiments to prove that a given model is correct.
(d) Any model that cannot explain the observations is useless and should be discarded.
(e) We prove a model is right when we observe the predictions it makes.
Relate Kepler’s third law of planetary motion to Newton’s law of gravitation and centripetal acceleration.
Chapter 2 Solutions
Life in the Universe (4th Edition)
Ch. 2 - Describe at least three characteristics of Greek...Ch. 2 - What do we mean by a model of nature? Summarize...Ch. 2 - What is apparent retrograde motion, and why was it...Ch. 2 - Who first proposed the idea that Earth is a planet...Ch. 2 - Prob. 5RQCh. 2 - What was the Copernican revolution, and how did it...Ch. 2 - Why didnt Copernicuss model gain immediate...Ch. 2 - State and explain each of Keplers laws of...Ch. 2 - Briefly describe three reasonable objections to...Ch. 2 - How did Newtons discoveries about the laws of...
Ch. 2 - How did the Copernican revolution affect scholarly...Ch. 2 - What is the difference between a hypothesis and a...Ch. 2 - Describe each of the three hallmarks of science...Ch. 2 - What is Occams razor? Give an example of how it...Ch. 2 - Why doesnt science accept personal testimony as...Ch. 2 - In what sense is gravity both a fact and a theory?...Ch. 2 - What is Newtons universal law of gravitation?...Ch. 2 - Prob. 18RQCh. 2 - Lionel Messi is the best soccer player of his...Ch. 2 - Several kilometers below its surface, Europa has...Ch. 2 - My house is haunted by ghosts, who make the...Ch. 2 - There are no lakes or seas on Mars today.Ch. 2 - All life in the universe must use DNA as its...Ch. 2 - Children born when Jupiter is in the constellation...Ch. 2 - Prob. 25TYUCh. 2 - Newtons law of gravity explains the orbits of...Ch. 2 - God created the laws of motion that were...Ch. 2 - Prob. 28TYUCh. 2 - In Ptolemys geocentric model, the retrograde...Ch. 2 - Which of the following was not a major advantage...Ch. 2 - Earth is closer to the Sun in January than in...Ch. 2 - According to Keplers third law, (a) Mercury...Ch. 2 - Tycho Brahes contributions to astronomy included...Ch. 2 - Galileos contributions to astronomy included (a)...Ch. 2 - Which of the following is not true about...Ch. 2 - Which of the following is not true about a...Ch. 2 - How did the Copernican revolution alter...Ch. 2 - When Einsteins theory of gravity (general...Ch. 2 - Greek Models. As we discussed in this chapter, the...Ch. 2 - Copernican Players. Using a bulleted list format,...Ch. 2 - Atomists and Aristotelians. The ancient Greek...Ch. 2 - Influence on History. Based on what you have...Ch. 2 - Sedna Orbit. The object Sedna orbits our Sun at an...Ch. 2 - Eris Orbit. The dwarf planet Eris, which is...Ch. 2 - New Planet Orbit. A newly discovered planet orbits...Ch. 2 - Halleys Orbit. Halleys Comet orbits the Sun every...Ch. 2 - Newtons Universal Law of Gravitation. a. How does...Ch. 2 - Science and Religion. Science and religion are...Ch. 2 - The Impact of Science. The modern world is filled...Ch. 2 - Absolute Truth. An important issue in the...Ch. 2 - Pseudoscience. Choose a pseudoscientific claim...Ch. 2 - Prob. 60WP
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- Kepler’s First Law: Elliptical Planetary Orbits: The solar system major planet in the most elliptical solar orbit is little Mercury, which is the closest planet to the Sun. At Perihelion, Mercury’s distance from the Sun (Rp) is 0.31 AU. At Aphelion, Mercury’s distance from the Sun (Ra) is 0.47 AU. The intensity of Sunlight (I) that a planet receives from the Sun is inversely proportional to the square of that planet’s distance from the Sun (R). in other words, I = Constant / R2. Calculate how much more intense the Sunlight received by Mercury is at perihelion (p) than at aphelion (a): Rp2 = Ra2 = Ip / Ia = Ra2 / Rp2 =arrow_forwardShow mathematically how Kepler’s third law can be derived from Newton’s law of universal gravitation. Hint: use the centripetal force (force directed towards the center) which is equal to the gravitational force in orbital motion.arrow_forwardThe fictional asteroid Lilliput orbits around the Sun one time every 3.605 Earth years. What is the average distance for Lilliput away from the Sun in astronomical units (AU)? One astronomical unit is equal to the average distance the Earth is away from the Sun, 1.496x1011m. The mass of the Sun is 1.989x1030kg.arrow_forward
- Johannes Kepler worked as an assistant to the observatory of Brahe at the age of 27. Brahe collected astronomical observations, which were passed into Kepler, on his death. Among the significant contributions of Brahe: 1. His observations on the planetary motion of Mars were used by later astronomers, including Kepler to construct the present model of the solar system. 2. In 1572, he observed supernova as a star that appeared suddenly, became visible for 18 months before it faded from view. Nowadays, supernova is called an exploding star. 3. In 1577, he observed a comet by measuring its parallax. His claim contradicted the idea of Aristotle that comets are "gases burning in the atmosphere." By measuring the parallax for the comet, he was able to show that the comet was further away than the Moon. 4. His findings that stars do not have parallax, he concluded that either: (a). the earth was motionless at the center of the universe; or (b). the stars were so far away that their parallax…arrow_forwardOxygen Atoms in People. Figure 5.7 shows that oxygen makes up about 65% of the mass of a human being. A single oxygen atom has a mass of 2.66 × 10−26 kg. (a) Use this fact to estimate the number of oxygen atoms in your body. (Hint: If you know your weight in pounds, you can convert to kilograms by dividing by 2.2.) (b) Compare your answer to the number of stars in the observable universe (which is roughly 1022).arrow_forwardHow important was Tycho Brahe's work in the development of Kepler's law of planetary motion?arrow_forward
- How Do We Know? How does the scientific method give scientists a way to know about nature?arrow_forwardWhy do you think so many people still believe in astrology and spend money on it? What psychological needs does such a belief system satisfy?arrow_forwardWhat were four of Galileo’s discoveries that were important to astronomy?arrow_forward
- What is Galileo’s theory?arrow_forwardUse the Law of Gravitation with Kepler's third Law to determine the mass of the Sun. Don't forget to include units!arrow_forwardGalileo's telescopes were not of high quality by modern standards. He was able to see the moons of Jupiter, but he never reported seeing features on Mars. Use the small-angle formula to find the angular diameter of Mars when it is closest to Earth. How does that compare with the maximum angular diameter of Jupiter? (Assume circular orbits with radii equal to the average distance from the Sun. Using the following distances from the Sun: Mars is 228 million km, Jupiter is 778 million km, and Earth is 150 million km. The radius of Mars is 3396 km. The radius of Jupiter is 71,492 km.) angular diameter of Mars = ( )seconds of arc angular diameter of Jupiter =( )seconds of arc ratio of angular diameters (Jupiter/Mars) = ( )arrow_forward
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