21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 4, Problem 19QP
To determine

Why the constant of proportionality of weight proportional to mass vary from Earth to Moon.

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Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg , and its radius is 6.38×106m (6380 km ). Use the inverse-square law to find a height above Earth's surface at that the force of gravity on a shuttle is about 94% that at Earth's surface. Express your answer to two significant figures and include the appropriate units.
You step on the scale and it says 1200kg. Your brother steps on the scale and it’s says 250 pounds. Who is heavier, you or your brother? An orange weighs about 1N. What is the mass of orange in grams? If a scale says 80 kg after you step on it, is that a measure of your weight? Explain your answer. Which is heavier, a 2kg feather or a 19.6 N nails? Explain your answer. Does a 25-g object on Earth will have the same weight if placed on the Moon? Explain your answer. What is the weight of the object both on Earth and on Moon?
the weight, w, of an object varies inversely as the square of the distance, d, between the object and the center of Earth. If a man weighs 75kg on the surface of Earth, how much would he weigh 300km above the Earth's surface? (given the radius of the earth is approximately 6400km)
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