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# the objects described here in static equilibrium, dynamic

ISBN: 9780130606204 3

## Solution for problem 2CQ Chapter 5

Physics: Principles with Applications | 6th Edition

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Physics: Principles with Applications | 6th Edition

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Problem 2CQ

the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all? a. A girder is lifted at constant speed by a crane. b. A girder is lowered by a crane. It is slowing down. c. You’re straining to hold a 200 lb barbell over your head. d. A jet plane has reached its cruising speed and altitude. e. A rock is falling into the Grand Canyon. f. A box in the back of a truck doesn’t slide as the truck stops.

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Solution: A.object in static equilibrium do not move remains at rest.the object also cannot move in our frame of reference.a girder is lifted at constant speed by a crane is in dynamic equilibrium,because the girder motion is not acceleration,the net force on it must be zero.therefore the tension and weight must be in equilibrium in magnitude and opposite in direction. B.a girder is lowered by crane means it is not in equilibrium state,because the girder is slowing down, its acceleration is in the opposite direction from its motion.therefore the net force on girder is upward and tension is greater than the weight. C.we straining to hold a 200 lb barbell over your head.it means that is not accelerating it is remains at rest.because is in static equilibrium,Static equilibrium means if an object not moving within our frame of reference. D.A jet plane is reached its cruising speed and...

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