The following equation was obtained by solving a physics problem: 
The best physical representation of the situation is
A. A car traveling at 16.0 m/s is 19.2° into a turn of a quarter circle on a level road.
B. A mass on a string that is originally horizontal has fallen to where the angle between the string and the vertical direction is 19.2°.
C. A mass on a string originally horizontal has fallen 19.2° from the horizontal direction.
D. A car traveling at 16.0 m/s is on a circular curve banked at 19.2°.
E. A car traveling at 16.0 m/s and going over a semicircular mountain-top road is 19.2° down from the top.
Answer: D
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Copper has
current carrying electrons per
A copper wire of radius 0.15 mm carries a current of 17 mA. What is the average drift velocity for the electrons?
A. 
B. 
C. 
D. more information is needed for this calculation