The electric potential at the origin of an xy-coordinate system ...

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The electric potential at the origin of an xy-coordinate system is 40 V. A -8.0-C charge is brought from x = + to that point. What is the electric potential energy of this charge at the origin?
 
  A) -3.2  10-4 J
  B) 3.2  10-4 J
  C) -40 J
  D) 40 J
  E) 8.0 J

Question 2

One of the harmonics of a column of air open at both ends has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?
 
  A) 32 Hz
  B) 64 Hz
  C) 88 Hz
  D) 128 Hz
  E) 256 Hz

[zacnyjessica]

Answer to Question 1

A

Answer to Question 2

D

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