The energy of a molecule can normally be divided into the following categories:
a. rotational and vibrational
b. translational, rotational and vibrational
c. electronic, translational, rotational, and vibrational
d. rotational
e. electronic
c
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An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. The observer is traveling at a velocity of 24.00 m/s toward the ambulance and the ambulance is traveling at a velocity of 20.00 m/s toward the observer. What is the frequency of the siren perceived by the observer?
A. 2,489 Hz B. 2,560 Hz C. 2,675 Hz D. 2,725 Hz E. 2,830 Hz
A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the tangential acceleration of a point 3.0 cm from the center of the CD after 3.0 sec is
A. 0.40 
B. 0.25
C. 0.10
D. 0.06
E. 0.03
Who proposed a model with the Sun (rather than Earth) at the center of the solar system, which was then tested by the other people listed below?
a. Copernicus b. Tycho c. Kepler d. Galileo
Impulse: A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s2 on a frictionless table. What impulse does this force give to the object?
A. 26 kg ? m/s B. 11 kg ? m/s C. 8.4 kg ? m/s D. 2.6 kg ? m/s