# Assignments - Assignments 8:55 PM Chap 5 6 Quiz Circular...

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10/26/10 8:55 PM Assignments Page 1 of 9 http://session.masteringphysics.com/myct/assignments Chap 5 & 6 - Quiz - Circular Motio and Gravitation Due: 11:59am on Monday, October 18, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy . [ Switch to Standard Assignment View] Problem 5.50 Estimate the force a person must exert on a string attached to a 0.205 ball to make the ball revolve in a horizontal circle.The ball makes 2.30 revolutions per second ( = 0.435 ). Don't ignore the weight of the ball which revolves on a string 0.690 long. Part A In particular, find the magnitude of . [ Hint : Set the horizontal component of equal to ; also, since there is no vertical motion, what can you say about the vertical component of ?] Express your answer with the appropriate units. ANSWER: = 29.5 Correct Part B Find the angle makes with the horizontal. Express your answer with the appropriate units. ANSWER: = 3.90 Correct Problem 5.47 A jet pilot takes his aircraft in a vertical loop. As shown in the figure . [ Print ]

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10/26/10 8:55 PM Assignments Page 2 of 9 http://session.masteringphysics.com/myct/assignments Part A If the jet is moving at a speed of 1150 at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 5.5 's. Express your answer using two significant figures. ANSWER: = 1900 Correct Part B Calculate the 73 pilot's effective weight (the force with which the seat pushes up on him) at the bottom of the circle. Express your answer using two significant figures. ANSWER: = 4700 Correct Part C Calculate the 73 pilot's effective weight (the force with which the seat pushes up on him) at the top of the circle (assume the same speed). Express your answer using two significant figures. ANSWER: = 3200 Correct Problem 5.35 A child sitting 1.10 from the center of a merry-go-around moves with a speed of 1.50 . Part A Calculate the centripetal acceleration of the child. ANSWER: = 2.05
10/26/10 8:55 PM Assignments Page 3 of 9 http://session.masteringphysics.com/myct/assignments = Correct Part B Calculate the net horizontal force exerted on the child ( = 23.5 ).

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