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