Problem: Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all?(a) A 200-pound barbell is held over your head.(b) A girder is lifted at constant speed by a crane.(c) A girder is being lowered into place. It is slowing down.(d) A jet plane has reached its cruising speed and altitude.(e) A box in the back of a truck doesnt slide as the truck stops.

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Problem Details

Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all?
(a) A 200-pound barbell is held over your head.
(b) A girder is lifted at constant speed by a crane.
(c) A girder is being lowered into place. It is slowing down.
(d) A jet plane has reached its cruising speed and altitude.
(e) A box in the back of a truck doesnt slide as the truck stops.

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Our tutors have indicated that to solve this problem you will need to apply the 1D Equilibrium concept. If you need more 1D Equilibrium practice, you can also practice 1D Equilibrium practice problems.

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Based on our data, we think this problem is relevant for Professor Rinzler & McGill's class at UF.