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PHYS 101 chapter 4 &amp; 5 homework

# PHYS 101 chapter 4 &amp; 5 homework - PHYS 101-02...

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10/8/07 PHYS 101-02 Chapter 4 Exercises 6. A friend says that, because the earth’s gravity is so much stronger than the moon’s gravity, rocks on the moon could be dropped from the moon to the earth. What is wrong with this assumption? The great distance between the earth and the moon will outweigh the difference in gravity between the two. Therefore, the rocks will remain on the moon, not drop to the earth. 8. A friend says that astronauts in orbit are weightless because they’re beyond the pull of earth’s gravity. Correct your friend’s ignorance. An astronaut in orbit will always have some weight; the astronaut’s weight is determined by his distance from the center of the earth. Therefore, while his weight will be a fraction of what it would be on the earth, he will still have some weight. 11 If the earth were somehow expanded to a larger radius, with no change in mass, how would your weight be affected? How would it be affected if the earth were shrunk instead? (use equation for gravitational force) If the radius of the earth were larger, your weight would be less due to the fact that you would be farther from the center of the earth. Accordingly, if the earth shrunk, your weight would increase because you would be closer to the center of the earth. 15. Why do the passengers of high-altitude jet planes feel the sensation of weight while passengers in an orbiting space vehicle such as the space shuttle do not?

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