p201f08hw04a - MasteringPhysics: Assignment Print View Page...

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IUPhysicsP201F2009 Assignment 4a Due at 11:00pm on Tuesday, September 23, 2008 Assignment Display Mode: View Printable Answers View Grading Details A Mass on a Turntable: Conceptual Description: An object is sitting on a rotating turntable. The student is asked for the direction of velocity, acceleration, and net force. Based on Mechanics Baseline Test. A small metal cylinder rests on a circular turntable that is rotating at a constant rate, as illustrated in the diagram. Part A Which of the following sets of vectors best describes the velocity, acceleration, and net force acting on the cylinder at the point indicated in the diagram? Page 1 of 12 MasteringPhysics: Assignment Print View 9/17/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1144566
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Hint A.1 The direction of acceleration can be determined from Newton's second law According to Newton's second law, the acceleration of an object has the same direction as the net force acting on that object. ANSWER: a b c d e Part B Let be the distance between the cylinder and the center of the turntable. Now assume that the cylinder is moved to a new location from the center of the turntable. Which of the following statements accurately describe the motion of the cylinder at the new location? Part B.1 Find the speed of the cylinder Find the speed of the cylinder at the new location. Assume that the cylinder makes one complete turn in a period of time . Express your answer in terms of and . Now compare your result with the speed of the cylinder before it is moved. ANSWER: = Part B.2 Find the acceleration of the cylinder Find the magnitude of the acceleration of the cylinder at the new location. Assume that the cylinder makes one complete turn in a period of time . Express your answer in terms of and . Hint B.2.a Centripetal acceleration Recall that the acceleration of an object that moves in a circular path of radius with constant speed has magnitude given by . Note that both the velocity and radius of the trajectory change when the cylinder is moved. ANSWER: Page 2 of 12 MasteringPhysics: Assignment Print View 9/17/2008 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1144566
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Check all that apply. Now compare your result with the acceleration of the cylinder before it is moved. = ANSWER: The speed of the cylinder has decreased. The speed of the cylinder has increased. The magnitude of the acceleration of the cylinder has decreased. The magnitude of the acceleration of the cylinder has increased. The speed and the acceleration of the cylinder have not changed. Accelerating along a Racetrack Description: Determine the direction of acceleration of cars at various points along a race track A road race is taking place along the track shown in the figure . All of the cars are moving at constant speeds. The car at point F is traveling along a straight section of the track, whereas all the other cars are moving along curved segments of the track. Part A
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p201f08hw04a - MasteringPhysics: Assignment Print View Page...

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