A wire has a cross-sectional area of 0.10 mm2. If there are 4.0 1028 atoms per cubic meter in this wire, and if each atom contributes 2 free electrons,
what is the drift velocity of the electrons when the current in the wire is 6.0 A? (e = 1.60 10-19 C)
A) 0.0047 m/s B) 0.94 m/s C) 0.019 m/s D) 0.0092 m/s
Question 2
A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 meters. The sand is initially at rest and is discharged at the top of the sand mover with speed 5 m/s into a loading chute.
At what minimum rate must power be supplied to this machine? A) 524 w
B) 3.92 kw
C) 6.65 kw
D) 4.34 kw
E) 1.13 kw
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