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Author Question: The tension in each of two strings is adjusted so that both vibrate at exactly 819 Hz. The tension ... (Read 100 times)

serike

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on: Jul 29, 2018
The tension in each of two strings is adjusted so that both vibrate at exactly 819 Hz. The tension in one of the strings is then increased slightly. As a result, six beats per second are heard when both strings vibrate.
 
  What is the new frequency of the string that was tightened? A) 825 Hz
  B) 813 Hz
  C) 822 Hz
  D) 816 Hz

Question 2

A copper cylinder with a mass of 125 g and temperature of 345C is cooled by dropping it into a glass beaker containing 565 g of water initially at 20.0C. The mass of the beaker is 50.0 g and the specific heat of the glass is 840 J/kgK.
 
  What is the final equilibrium temperature of the system, assuming the cooling takes place very quickly, so that no energy is lost to the air? The specific heat of copper is 385 J/kgK and that of water is 4190 J/kgK.


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jointhecircus

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

A

Answer to Question 2

26.4C


serike

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Reply 2 on: Jul 29, 2018
Wow, this really help

Jsherida

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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