Resonance occurs when a 200-Hz tuning fork encounters a sound wave with a frequency of
A) 150 Hz.
B) 200 Hz.
C) 300 Hz.
D) any of the above
E) none of the above
Answer: B
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In modern physics, what is heat?
a. A change in energy marked by a change in temperature. b. A change in temperature caused by a change in energy. c. The flow of energy between objects due to a difference in their temperature. d. The opposite of cold. e. A change in work.
Work-Energy Theorem: In a ballistics test, a 28-g bullet pierces a sand bag that is 30 cm thick. If the initial bullet velocity was 55 m/s and it emerged from the sandbag moving at 18 m/s what was the magnitude of the friction force (assuming it to be constant) that the bullet experienced while it traveled through the bag?
A. 130 N B. 38 N C. 13 N D. 1.3 N
What is Pluto's moon Charon thought to have in common with our own Moon?
A) It probably formed as a result of a giant impact. B) It has the same basic composition. C) It has the same approximate mass. D) It has the same average density.
When a wave obliquely crosses a boundary into another medium, it is
A) refracted. B) diffracted. C) reflected. D) always slowed down. E) always speeded up.