A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
a. 2.3 m/s
b. 4.7 m/s
c. 3.5 m/s
d. 3.0 m/s
e. 7.0 m/s
b
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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. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,657 Hz B. 2,567 Hz C. 2,532 Hz D. 2,500 Hz E. 2,479 Hz
How do we know sunspots have magnetic fields?
A. Wien's law B. the Zeeman effect C. We have measured the sunspots' fields with spacecraft. D. the Hubble effect E. None of these choices is correct.
As you move farther away from a source emitting a pure tone, the ___________ of the sound you hear decreases
a. frequency b. period c. wavelength d. amplitude e. none of the above
. 
Reference: Ref 5-1
The latent heat of fusion is the amount of energy per kilogram necessary to go from point ______________ to point ______________.