The speed of sound in water is 4.3 times the speed of sound in air. A whistle produces a sound wave in air with a frequency 
When this sound wave enters the water, its frequency becomes
A. 4.3 
B. 
C. 
D. not enough information
B.
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Free Fall: To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance.
A. 10 m B. 14 m C. 26 m D. 32 m E. 52 m
The set of particles shown below all have the same mass and speed. Which has the largest magnitude of angular momentum around the point O? 
A. A B. B C. C D. D E. E
Consider Newton's second law states, often written as force = mass × acceleration. If a known force is applied to an object with a known mass, what does this law predict for the object's acceleration?
A) acceleration = mass × force B) acceleration = mass / force C) acceleration = force / mass D) Newton's second law is irrelevant for solving this problem.
Which of the following astronomical objects emit radiation mostly at non-visible wavelengths?
A. cold interstellar gas clouds B. dust clouds in space C. hot gas surrounding black holes D. All of these choices are correct.