A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one
a. It is the same since the posts don't move.
b. It is at a higher frequency than the original one.
c. It is at a lower frequency than the original one.
d. More than one answer is correct.
b
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A 50.0 cm long organ pipe is filled with air at 10.0
and is open at both ends. The velocity of sound in air at 0.00 
is 331 m/s. Another 50.0 cm long organ pipe is filled with air at 15.0
and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?
A. 2.96 Hz B. 2.45 Hz C. 2.10 Hz D. 1.94 Hz E. 1.77 Hz
Which molecule is most polar?
A) S=C=S B) O=C=O C) O=C=S D) These all have the same polarity.
Projectile Motion: A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100 m down range from the base of the building. What was the initial velocity of the ball? Neglect air resistance and use g = 9.81 m/s2.
A. 202 m/s B. 9.80 m/s C. 19.6 m/s D. 45.2 m/s E. 94.4°
A sprinter runs 100.0 m. If he travels at constant acceleration of 1.95 
for the first 75.0 m and then at constant velocity for the remaining distance, what was his total elapsed time for the whole race?
A. 11.3 s B. 9.8 s C. 10.1 s D. 10.2 s