Some people believe that aliens from elsewhere in the universe visit the earth in spacecraft that travel

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Some people believe that aliens from elsewhere in the universe visit the earth in spacecraft that travel faster than jet airplanes and can turn in their own lengths. Calculate the centripetal force on a 100-kg alien in a spacecraft moving at 500 m/s (1120 mi/h) while it is making a turn of radius 30 m. How many times the weight of the alien is this force? Do you think such stories can be believed?

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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