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September 21, 2014

September 21, 2014

Posted by **18ms** on Saturday, December 8, 2012 at 12:57am.

- thermodynamics -
**drwls**, Saturday, December 8, 2012 at 9:47amc) Your "density" is a weight density. The mass density is

(weight density)/g = 0.9405 slug/ft^3

Total volume is (mass)/(mass density)

= 0.311 slug/0.9405 slug/ft^3

= 0.3307 ft^3

Note: the correct value of g at the surface of the Earth is 32.2 ft/s^2, not 31.9. I will use your incorrect value.

b) specific weight is the ratio of density to that of water. Water's density (in weight/volume units) is 62.4 lb/ft^3

So the specific weight is 30/62.4 = 0.481 (dimensionless)

(a) For the specific volume, I will assume they want volume (ft^3) per lb.

relative to that of water. That is the reciprocal of specific weight, or 2.079 (dimensionless)

- thermodynamics -
**Jaylin**, Thursday, January 2, 2014 at 7:35amThe mass of a fluid system is 0.311 slug, its density is 30 lb/ft^3 and g is 31.90 fps^2. Find

a. the specific volume

v=1/p 1/30=.03333ft^3/s^2

b. the specific volume=pg/k

3olb/ft^3 times 31.90 ft/s^2 all over 32.174 lb.ft/lb.s^2 we get 29.7445 lb/ft^3

c. the total volume

.311 times 32.174 all over 30

we get 0.3335 ft^3

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