A 4.0-g string is 0.36 m long and is under tension. The string ...

[2125004343]

A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the wavelength of the standing wave in the string?
 
  A) 0.24 m
  B) 0.36 m
  C) 0.54 m
  D) 0.72 m
  E) 0.90 m

Question 2

Two tiny particles having charges of +7.00 C and -9.00 C are placed along the y-axis. The +7.00-C particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm.
 
  Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles?
  A) 0.200 m
  B) 2.99 m
  C) -0.187 m
  D) -2.99 m
  E) 0.187 m

[jonathanballen97]

Answer to Question 1

A

Answer to Question 2

D

[2125004343]

Thank you!

[jonathanballen97]

Always glad to help...