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Question 1: A grain of sand (p 1690 kg/m3) that has a 1.5 mm diameter falls into a saltwater pond that is 12 m deep. The saltwater has a density of ?-1024 kg/m3 and a viscosity of ? = 0.960P. Calculate how much time (in seconds) it will take the sand grain to hit the bottom of the pond. Assume that the grain achieves its terminal velocity almost immediately after being dropped.

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