A 0.13-m string, fixed at both ends and vibrating in its n = 4 ...

[altibaby]

A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is long and open at both ends, into its second overtone resonance.
 
  What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.
  A) 30 m/s B) 38 m/s C) 36 m/s D) 32 m/s E) 34 m/s

Question 2

If the temperature of an ideal gas is increased from 20C to 40C, by what percent does the speed of the molecules increase?
 
  A) 3
  B) 30
  C) 70
  D) 100

[raenoj]

Answer to Question 1

B

Answer to Question 2

A