A 1.50-m long gas column that is open at one end and closed at ...

[Diane]

A 1.50-m long gas column that is open at one end and closed at the other has a fundamental resonant frequency 80.0 Hz. What is the sound speed in this gas?
 
  A)
 
  120 m/s
 
  B)
 
  53.3 m/s
 
  C)
 
  30.0 m/s
 
  D)
 
  213 m/s
 
  E)
 
  480 m/s

Question 2

Two children are carrying a 2.00-m long uniform level board with a mass 5.00 kg, each supporting one end of the board. A 1.00-kg book is resting on the board a distance 1.20 m from one end of the board.
 
  What is the force applied by the child that is closer to the book to support the board? A)
 
  29.4 N downward
  B)
 
  58.9 N upward
  C)
 
  29.4 N upward
  D)
 
  30.4 N upward
  E)
 
  3.10 N upward

[gabrielle_lawrence]

Answer to Question 1

E

Answer to Question 2

D