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Joined: 20/03/2019(UTC) Posts: 73  Location: Mandeville, LA
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I am having problems with a specific calculation. I have a sheet that has the following on it:  The answer for C is wrong. If I put it in a separate file on a sheet, the number comes out correctly as 4720 fps. Can you help?
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Rank: Advanced Member Groups: Registered
Joined: 28/08/2014(UTC) Posts: 1,356  Was thanked: 815 time(s) in 516 post(s)
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Hi. Hope that this helps: As I know, the speed of the sound into a fluid is sqrt(K/rho)=14.9245 ft/sec, for your data and where K is the fluid bulk modulus and rho the fluid density. With your rho, in lbm/ft^3, this is the fluid density. You need g only if you have the specific weight gamma = rho/g. I know that a lot of books use rho for both: density and specific weight, and it's very confusing that notation.  Best regards. Alvaro. Edited by user 29 March 2019 07:31:47(UTC)
| Reason: Correct the bulk modulus for water.
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 Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866  Was thanked: 981 time(s) in 809 post(s)
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Originally Posted by: Britt1  I am having problems with a specific calculation You are asking the volunteers to remake the document. On the other hand, working with fluids, the source information(s) is required.
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Rank: Advanced Member Groups: Registered
Joined: 20/03/2019(UTC) Posts: 73 Location: Mandeville, LA
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Sorry all, when I was looking at this, it was at the end of the day, and I was dead tired. I used the wrong number for the bulk modulus of water. All is fine. Edited by moderator 29 March 2019 17:15:41(UTC)
| Reason: marked as solved
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