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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman
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At a classic auto show, a 840-kg 1955 Nash Metropolitan

Chapter 10, Problem 76P

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QUESTION:

At a classic auto show, a 840-kg 1955 Nash Metropolitan motors by at 9.0 m/s, followed by a 1620-kg 1957 Packard Clipper purring past at 5.0 m/s. (a) Which car has the greater kinetic energy? What is the ratio of the kinetic energy of the Nash to that of the Packard? (b) Which car has the greater magnitude of momentum? What is the ratio of the magnitude of momentum of the Nash to that of the Packard? (c) Let ?F?N be the net force required to stop the Nash in time ?t?, and let ?F?p be the net force required to stop the Packard in the same time. Which is larger: ?F?N or ?F?P? What is the ratio ?F?N/?F?P of these two forces? (d) Now let ?F?N be the net force required to stop the Nash in a distance d, and let ?F?P be the net force required to stop the Packard in the same distance. Which is larger: ?F?N or ?F?P? What is the ratio ?F?N/?? ?

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QUESTION:

At a classic auto show, a 840-kg 1955 Nash Metropolitan motors by at 9.0 m/s, followed by a 1620-kg 1957 Packard Clipper purring past at 5.0 m/s. (a) Which car has the greater kinetic energy? What is the ratio of the kinetic energy of the Nash to that of the Packard? (b) Which car has the greater magnitude of momentum? What is the ratio of the magnitude of momentum of the Nash to that of the Packard? (c) Let ?F?N be the net force required to stop the Nash in time ?t?, and let ?F?p be the net force required to stop the Packard in the same time. Which is larger: ?F?N or ?F?P? What is the ratio ?F?N/?F?P of these two forces? (d) Now let ?F?N be the net force required to stop the Nash in a distance d, and let ?F?P be the net force required to stop the Packard in the same distance. Which is larger: ?F?N or ?F?P? What is the ratio ?F?N/?? ?

ANSWER:

Solution 76P Problem (a) Step 1: Mass of Nash Metropolitan m = 840.0 Kg 1 Mass of Packard Clipper m = 1620.2Kg Speed of Nash Metropolitan v = 9.0 m1 Speed of Packard Clipper v = 5.0 2

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