The Essential Cosmic Perspective (8th Edition)
8th Edition
ISBN: 9780134446431
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 4, Problem 30EAP
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1) Calculate the tidal force (the difference in gravitational force from right to left side or G(R) - G(L) ) from a person sitting next to you (approximately 1 meter away). You will need to make some estimations on mass and size of a normal person.
2) Compare the tidal force on a person from the Moon and a person standing nearby (the answers to the previous two questions). Which is greater and by how much?
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What is the angular momentum of the Moon in its orbitaround Earth?How does this angular momentum compare with theangular momentum of the Moon on its axis? Remember that the Moon keeps one side toward Earth at all times.Discuss whether the values found in both parts seem consistent with the fact that tidal effects with Earth have caused the Moon to rotate with one side always facing Earth.
Chapter 4 Solutions
The Essential Cosmic Perspective (8th Edition)
Ch. 4 - Prob. 1VSCCh. 4 - Check your understanding of some of the many types...Ch. 4 - Check your understanding of some of the many types...Ch. 4 - Check your understanding of some of the many types...Ch. 4 - Check your understanding of some of the many types...Ch. 4 - Define speed, velocity, and acceleration. What are...Ch. 4 - Define momentum and force. What do we mean when we...Ch. 4 - What is free-fall, and why does it make you...Ch. 4 - Prob. 4EAPCh. 4 - Prob. 5EAP
Ch. 4 - Define kinetic energy, radiative energy, and...Ch. 4 - Define and distinguish temperature and thermal...Ch. 4 - Prob. 8EAPCh. 4 - Summarize the universal law of gravitation both in...Ch. 4 - What is the difference between a bound and an...Ch. 4 - Under what conditions can we use Newton’s version...Ch. 4 - Explain why orbits cannot change spontaneously,...Ch. 4 - Explain how the Moon creates tides on Earth. Why...Ch. 4 - How do the tides vary with the phase of the Moon?...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - Decide whether the statement makes sense (or is...Ch. 4 - A car is accelerating when it is (a) traveling on...Ch. 4 - Compared to their values on Earth, on another...Ch. 4 - Which person is weightless? (a) a child in the air...Ch. 4 - Consider the statement “There’s no gravity in...Ch. 4 - To make a rocket turn left, you need to (a) fire...Ch. 4 - Compared to its angular momentum when it is...Ch. 4 - Prob. 31EAPCh. 4 - If Earth were twice as far from the Sun, the force...Ch. 4 - According to the law of universal gravitation,...Ch. 4 - If the Moon were closer to Earth, high tides would...Ch. 4 - Testing Gravity. Scientists are constantly trying...Ch. 4 - How Does the Table Know? Thinking deeply about...Ch. 4 - 37. Your Ultimate Energy Source. Roles: Scribe...Ch. 4 - Weightlessness. Astronauts are weightless when in...Ch. 4 - Einstein’s Famous Formula. a. What is the meaning...Ch. 4 - The Gravitational Law. a. How does quadrupling the...Ch. 4 - Prob. 41EAPCh. 4 - Head to Foot Tides. You and Earth attract each...Ch. 4 - Prob. 43EAPCh. 4 - Prob. 44EAPCh. 4 - Prob. 45EAPCh. 4 - Prob. 46EAPCh. 4 - Prob. 47EAPCh. 4 - Prob. 48EAPCh. 4 - Space Station. Visit a NASA site with pictures...Ch. 4 - Prob. 50EAPCh. 4 - Prob. 51EAP
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- How do planets orbiting the Sun and skaters doing a spin both conserve angular momentum?arrow_forwardUsing data from the previous problem, find the increase in rotational kinetic energy, given the core’s mass is 1.3 times that of our Sun. Where does this increase in kinetic energy come from?arrow_forwardThe Sun’s mass is 2.01030kg , its radius is 7.0105km , and it has a rotational period of approximately 28 days. If the Sun should collapse into a white dwarf of radius 3.5103km , what would its period be if no mass were ejected and a sphere of uniform density can model the Sun both before and after?arrow_forward
- Why is it that the moon exerts a larger tidal force on the Earth than the Sun does, even though the Sun is so very much more massive than the Moon?arrow_forwardWhile the Earth spins around its axis and orbits around the sun, then suppose we remove the sun from its location, will Earth continue to spin around its axis and orbits around the point where the sun used to be? Why or why not?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
- 48. In Cosmic calculate 9.1 we found tidal force that earth exerts on the moon. Following the SAME PROCEDURE, calculate the tidal force earth would have exerted on the moon shortly after the moon formed, when it was only about 1/10 its current distance from earth. How much greater was the tidal force than it is today? What does this tell you about how a factor-of-10 change in distance affects the tidal force? (9.1--->. Fg=G(M1M2/d2)arrow_forwardSuppose you stood a top ladder so tall that you were 3 times as far from Earth‘s center as you presently are. Show that your weight would be 1/9 of it’s present value.arrow_forwardFungi Grass Uses dead matter for ensy D Uses energy gained from plants G H Uses energy directly fro ater Uses enealrectly from the sun M P 2. The table shows the rotational and orbital periods for Mars and Earth. Rotational and Orbital Periods for Mars and Earth Rotatlonal Perlod (hours) Orbital Period (Earth days) Planet Earth 23.9. 365.2 Mars 24.6 687.0 Which conclusion is supported by the data for Mars and Earth? A. A day on Mars is longer than a year on Mars. B. A year on Mars is shorter than a year on Earth. C. Mars spins on its axis at a rate similar to Earth's. D. Mars orbits the sun faster than the Earth orbits the sun. Go to the nearrow_forward
- Choose the BEST answer to the following: The highest ocean tides occur when the Earth and Moon are (a) lined up with the Sun. (b) at right angles to the Sun. (c) at any angle to the Sun. (d) lined up during spring.arrow_forward50. The perihelion of Halley's comet is 0.586 AU and the aphelion is 17.8 AU. Given that its speed at perihelion is 55 km/s, what is the speed at aphelion (1AU=1.496×1011m)? (Hint: You may use either conservation of energy or angular momentum, but the latter is much easier.)arrow_forwardlaw of planetary motion tells us about the constant variable in planetary orbits in line with the proportion of revolution period and distance from the sun?arrow_forward
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