Thread: Substituting values and solving for an unknown

please give me a solution
i need to find the value of V in the following equation
(p+(a/V^2))*(V-b)=RT
where
P=9500KPa
R=.2968Kj/k/kg
T=175 K
a=27R^2*Tcr^2?(64*Pcr)
b=(R*Tcr)/(8Pcr)
Tcr=136.2 K
Pcr=3.39MPa

Hello self_shattered

Originally Posted by self_shattered

please give me a solution
i need to find the value of V in the following equation
(p+(a/V^2))*(V-b)=RT
where
P=9500KPa
R=.2968Kj/k/kg
T=175 K
a=27R^2*Tcr^2?(64*Pcr)
b=(R*Tcr)/(8Pcr)
Tcr=136.2 K
Pcr=3.39MPa

The best advice I can give now is to use a numerical method; e.g. Newton-Raphson, with and .

I'm not sure what the numerical values are, especially

a=27R^2*Tcr^2?(64*Pcr)

What does ? mean?

If you don't know how to use Newton-Raphson, work out the numerical values of (don't bother with the units, they only confuse things); post them here, and I'll do it for you.

Grandad