The Cosmic Perspective
The Cosmic Perspective
7th Edition
ISBN: 9780321896766
Author: SCHNEIDER
Publisher: YUZU
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Textbook Question
Chapter 1, Problem 47EAP

Faster Trip. Suppose you wanted to reach Alpha Centauri in 100 years.

a. How fast would you have to go, in km/hr? b. How many times faster is the speed you found in part a than the speed of our fastest current spacecraft (around 50,000 km/hr)?

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I'd like an answer to part "B" only and explanation if possible so I know how deal with these kind of problems in the future.

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The Cosmic Perspective

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  • 1. Why were the main reasons why the idea that the Earth was at the center of the universe lasted so long? 2. Discuss in 2 paragraphs the observations made by Galileo that disproved Geocentrism. Which one do you think was the most important? 3. Write down a hypothesis and observational experiment to test one of Newton’s laws of motion. EXPLAIN YOUR REASONING! 4. One of the first exoplanets discovered orbits the star 51 Pegasi with a period of just 4.2 days. 51 Pegasi is very similar to the Sun. Use Kepler’s laws to find the distance (in astronomical units) between the planet (unofficially named Bellerophon) and its star. SHOW YOUR WORK! 5.  How does halving the distance between two objects affect the gravitational force between them? 6. Suppose the Sun were somehow replaced by a star with five times as much mass. What would happen to the gravitational force between the Earth and the Sun? 7. How long would the Earth year last in this last case? (hint: Newton’s version of Kepler’s 3rd…
    Please answer the following  A) Suppose an object takes 1000 years to orbit the Sun. How many times farther from the Sun is it, when compared with Earth?  B)  Communications with the spacecraft Alpha using radio waves require 2000 years for the round trip (there and back). This implies that Alpha is how many light years away from Earth?
    Suppose we find an Earth-like planet around one of our nearest stellar neighbors, Alpha Centauri (located only 4.4 light-years away). If we launched a "generation ship" at a constant speed of 1500.00 km/s from Earth with a group of people whose descendants will explore and colonize this planet, how many years before the generation ship reached Alpha Centauri? (Note there are 9.46 ××1012 km in a light-year and 31.6 million seconds in a year.
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