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Q. An object weighing 323-N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 289-N. Immersed in oil; object weighs 300 N. compute the density of the object.

Q. The loaded cab of an elevator has a mass of 3000kg and moves 216-m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab?

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