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July 28, 2015

Homework Help: college physics

Posted by Karrine on Saturday, December 15, 2012 at 8:11pm.

have a couple of questions about my homework and it's due at midnight tonight:

1. On a hot summer day, the temperature of air in Arizona reaches 115F. What is the speed of sound in air at this temperature? (Enter your answer to four significant figures. The speed of sound at 0C is 331 m/s. Use the conversion 0C = 273 K as necessary.)
I changed F to K (got 315.928) and I plugged it in the appropiate equation:
331m/s(315.928/273)^(1/2) and I got 356.1. This is not right what do I do?

2.A dolphin located in sea water at a temperature of 25C emits a sound directed toward the bottom of the ocean 105 m below. How much time passes before it hears an echo?
I did two different equations: dividing 105 by the temp in K, then I tried 331(298K/273 k)^(1/2) then I multiplied it by to (to denote that the sound had to return back) and got 0.607 but that wasnt right.

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