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Unformatted text preview: Conceptual Physics Problem Set on Centripetal Force and Universal Gravitation 1. In the Biblical tale of David and Goliath, the giant is slain when David hits him with a rock that he has spun around overhead in a sling. If the rock is spun with a frequency of 100 revolutions per minute, what is the rocks period? 2. Ashton the ant is crawling on the still blade of a ceiling fan when the fan is turned on, causing Ashton to go for a ride. If Ashton sits on the fan blade at a distance of 0.80 m from the center of the fan and turns with a frequency of 1.2 Hz, a) how fast does Ashton spin? b) If Ashton slips off the spinning fan, describe the path he will take. 3. In Rumpelstiltskin, the millers daughter is spinning straw into gold on a spinning wheel that turns at a speed of 7.5 m/s, making one revolution every 0.50 s. How long is a strand of gold that makes one complete turn around the wheel? 4. A 3.20-kg hawk circles overhead in search of prey. a) If the hawk circles once every 10.0 s in a circle 12.0 m in radius, what is the linear speed of the hawk? b) What centripetal force allows him to remain in a circle? c) What is providing the centripetal force? 5. Sashas favorite ride at the fair is the Ferris wheel that has a radius of 7.0 m. a) If the ride takes 20.0 s to make one full revolution, what is the linear speed of the wheel? b) What centripetal force will the ride exert on Sashas 50.0-kg body? c) Does Sasha feel as if she is being pulled in or out by the ride? d) Explain the difference between what she feels and what is really happening at the top and bottom of the wheel.really happening at the top and bottom of the wheel....
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- Fall '10