Two equal point charges Q are separated by a distance d. One of ...

[crobinson2013]

Two equal point charges Q are separated by a distance d. One of the charges is released and moves away from the other due only to the electrical force between them.
 
  When the moving charge is a distance 3d from the other charge, what is its kinetic energy?

Question 2

A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long. When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 7.84 ms later, having reflected off the lower end.
 
  The speed of sound in the room is 344 m/s, and the stone is heavy enough to prevent the lower end of the wire from moving. If the wire is vibrating in its second overtone, what is the frequency of the sound it will produce?
  A) 383 Hz B) 128 Hz C) 191 Hz D) 255 Hz E) 765 Hz

[upturnedfurball]

Answer to Question 1

Q2/6 0d

Answer to Question 2

A

[crobinson2013]

Both answers were spot on, thank you once again

[upturnedfurball]

Great! Please up vote