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Physics / University Physics 13 / Chapter 7 / Problem 3E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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CP A 90.0-kg mail bag hangs by a vertical rope 3.5 m long.

Chapter 9, Problem 3E

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QUESTION:

CP? A 90.0-kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut. (a) What horizontal force is necessary to hold the bag in the new position? (b) As the bag is moved to this position, how much work is done (i) by the rope and (ii) by the worker?

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QUESTION:

CP? A 90.0-kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut. (a) What horizontal force is necessary to hold the bag in the new position? (b) As the bag is moved to this position, how much work is done (i) by the rope and (ii) by the worker?

ANSWER:

Solution 3E To solve this question, let us have a look at the figure below where various forces and their components are shown for the system. Let the tension in the rope is T and acts as shows above. From the figure, sin x = 3.5 x = sin 1(2.0) 3.5 0 x = 34.7 Also, the horizont

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