How do you calculate how many stamps are needed for mailing within the United States?

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Question by LuvWright5: How do you calculate how many stamps are needed for mailing within the United States?
How do you know how many stamps are needed when weighing an envelope in grams? Thanks guys!


Best answer:

Answer by Wounded Duck
You go to the Post Office where they weigh it and tell you the amount of postage necessary.

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How many overtones are present within the audible range for a 2.53 m long organ pipe at 10°C if it is open?

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by rexb

Question by Shawn: How many overtones are present within the audible range for a 2.53 m long organ pipe at 10°C if it is open?
How many overtones are present within the audible range for a 2.53 m long organ pipe at 10°C if it is open?
How many are present if it is closed?


Best answer:

Answer by kirchwey
A formula for sound speed is c = 331.3+0.606*T(C) (see ref.), so we'll set c = 331.3+6.06 = 337.36 m/s. Then the fundamental frequency of the pipe = 337.36/(2*2.53) = 66.6719 Hz. Each integer multiple of this frequency can be produced by the pipe. Thus the number of audible overtones including the fundamental = INT(20000/66.6719) = 299.

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