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
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