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Author Question: Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other ... (Read 57 times)

CORALGRILL2014

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on: Jul 29, 2018
Two motors in a factory are running at slightly different rates. One runs at 825.0 rpm and the other at You hear the sound intensity increase and then decrease periodically due to wave interference.
 
  How long does it take between successive instances of the sound intensity increasing?
  A) 1.79 s B) 1.43 s C) 1.54 s D) 1.66 s

Question 2

How many molecules are in (a) 1.0 cm3 of air at STP and (b) 1.0 cm3 of helium at STP? (R = 8.31 J/mol  K, NA = 6.022  1023 molecules/mol)
 
  What will be an ideal response?


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sierramartinez

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

C

Answer to Question 2

2.7  1019 molecules in both cases


CORALGRILL2014

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

sultana.d

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Reply 3 on: Yesterday
Excellent

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