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phys111_oct28_lecture.pdf

phys111_oct28_lecture.pdf - Newtons Law of Universal...

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Acceleration due to gravity is what we’ve been calling “little g” “little g” will vary with altitude : In general, Newton’s Law of Universal Gravitation on Earth:
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Clicker Question 13.5
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Clicker Question 13.5
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Newton’s Law of Universal Gravitation
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Clicker Question 13.6
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Clicker Question 13.6
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Gravitational Potential Energy PE = mgh is valid only near the earth’s surface For objects high above the earth’s surface, an alternate expression is needed: With r > R earth Zero reference level is infinitely far from the earth
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Escape Speed & the Motion of Satellites The escape speed is the speed needed for an object to soar off into space and not return. Note, v esc is independent of the mass of the object. It only depends on the mass of Earth!
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Clicker Question 13.9
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Clicker Question 13.9
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Escape Speed & the Motion of Satellites The trajectory of a projectile fired from A toward B depends on its initial speed.
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