Problem Set 2

Problem Set 2 - Problem Set 2 Due: 11:59pm on Monday,...

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Problem Set 2 Due: 11:59pm on Monday, October 11, 2010 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy [Switch to Standard Assignment View] Problem 4.51 The figure shows a block (mass ) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block , which hangs vertically. Part A Draw a free-body diagram for block A, showing the force of gravity on it, the force (tension) exerted by the cord, and any normal force. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded. ANSWER: View Answer Requested Part B Draw a free-body diagram for block B, showing the force of gravity on it, the force (tension) exerted by the cord, and any normal force. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded. ANSWER:
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View Answer Requested Part C Apply Newton's second law to find the formula for the acceleration of the system. Ignore friction and the masses of the pulley and cord. Express your answer in terms of the variables , , and appropriate constants. ANSWER: = Correct Part D Apply Newton's second law to find the formula for the tension in the cord. Ignore friction and the masses of the pulley and cord. Express your answer in terms of the variables , , and appropriate constants. ANSWER: = Correct Problem 4.54 Suppose the pulley in the figure is suspended by a cord . Part A Determine the tension in this cord after the masses are released and before one hits the ground. Ignore the mass of the pulley and cords. Express your answer using two significant figures. ANSWER: = 34 Correct Problem 4.55
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A small block of mass rests on the sloping side of a triangular block of mass which itself rests on a horizontal table as shown in the figure . Part A Assuming all surfaces are frictionless, determine the magnitude of the force that must be applied to so that remains in a fixed position relative to (that is, doesn't move on the incline). [Hint: Take and axes horizontal and vertical.] Express your answer in terms of the given quantities and appropriate constants. ANSWER: = Correct Problem 4.33 One 4.0- paint bucket is hanging by a massless cord from another 4.0- paint bucket, also hanging by a massless cord, as shown in the figure . Part A If the buckets are at rest, what is the tension in each cord? Express your answer using two significant figures. ANSWER: = 39 Correct Part B Express your answer using two significant figures. ANSWER: = 78 Correct Part C If the two buckets are pulled upward with an acceleration of 1.60 by the upper cord, calculate the tension in each cord.
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This note was uploaded on 10/23/2010 for the course PHYSICS 6A taught by Professor Koskeshian during the Fall '10 term at UCLA.

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Problem Set 2 - Problem Set 2 Due: 11:59pm on Monday,...

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