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Author Question: When a solid melts, A) the temperature of the substance increases. B) the temperature of the ... (Read 88 times)

WWatsford

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on: Jul 29, 2018
When a solid melts,
 
  A) the temperature of the substance increases.
  B) the temperature of the substance decreases.
  C) heat energy leaves the substance.
  D) heat energy enters the substance.

Question 2

Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s.
 
  What beat frequency do you observe? The speed of sound in the room is 330 m/s.
  A) 13 Hz
  B) 431 Hz
  C) 26 Hz
  D) 4.7 Hz
  E) 118 Hz


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quynhmickitran

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: D

Answer to Question 2

Answer: C


WWatsford

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Reply 2 on: Jul 29, 2018
Excellent

brbarasa

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Reply 3 on: Yesterday
Gracias!

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