Power: A sand mover at a quarry lifts 2000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute. What minimum power must be supplied to this machine?
A. 520 W
B. 3.9 kW
C. 6.7 kW
D. 4.3 kW
E. 1.1 kW
Answer: D
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