Fluid density physics problem
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Fluid density physics problem

[From: ] [author: ] [Date: 12-04-12] [Hit: ]
If you then lower the statue into a tub of water, so that it is completely submerged, the scale reads 12.2 N. What is the density?I tried solving for buoyancy to get volume (.......
You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 36.2 N. If you then lower the statue into a tub of water, so that it is completely submerged, the scale reads 12.2 N. What is the density? (In kg/m^3)

I tried solving for buoyancy to get volume (.00124). Then using F=mg to with the 36.2 N to find m. 'But when I plugged it into the d=m/v equation I got 2967.21 kg/m^3

Help please, not sure where I'm going wrong

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Yes, you need to get volume solving for buoyancy but you need to check your calculations.
I will call buoyancy force, F_b. so
36.2-12.2=24N
F_b=24N

F_b=V_b*d_liquid*g
since the liquid is water the density (you can find off the tables) is 997kg/m^3 (at 25C)
also it is completely submerged so V_b (buoyancy volume) is equal to V.
24=V*997*9.81
Solving V in this equation gave me 0.002454 and its units is m^3

Density is mass divided by volume.
d=m/V
you can find mass from the weight
W=36.2=m*g
36.2=m*9.81
m=3.69kg

d=3.69/0.002454
d=1503.7 kg/m^3

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(36.2 - 12.2) = water weight of 24N. displaced.
24N = (24/9.8) = 2.44898kg. of water.
Volume displaced = 2.44898 litre, which is 2,448.98cc.
(36.2/9.8) = 3.6938kg., which is 3,693.8g.
Density = (3,693.8/2,448.98) = 1.508g/cc., or 1,508kg/m^3.
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