College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Just a little something on momentum and kinetic energy. As a reminder, momentum is a vector and:
p = mv
K = 1/2 mv2 = 1/2 pv = p2/2m
In terms of the dot product: v2 = v⋅v, p2 = p⋅p, and pv = p⋅v.
Unlike speed vs. velocity, but like all other vectors, momentum may refer to the magnitude of the momentum vector.
Now, answers the following questions:
1) A 7-kg particle goes 96 m/s. Calculate its momentum in kg*m/s. (This requires an exact answer.)
2) A 7-kg particle's momentum is (392, 61) kg*m/s. Calculate its kinetic energy.
3) A pebble and a grapefruit have the same momentum. Which has the greater kinetic energy?
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