Recent content by CRich

Homework Statement σ=230MPa (tensile strength) E=15GPa (modulus) ρ=1.85 g/cm^3 (density) Homework Equations Strength/Weight = σ/ρ Modulus/Weight = E/ρ The Attempt at a Solution Strength/Weight = σ/ρ = 230x106 N/m2 / 1850 kg/m2 = 124324.32 (Units?)...

no the water isn't boiling...Ive changed my method...which yields a better result... I'm heating up an object to a known temp and submersing it into the liquid and using that to find the Sc

I used 4.19 as the specific heat and yes the mass if water is very small at 15.1g DeltaTc=79.1 DeltaTw=78.4 mass of copper=31.5g

I have a project due tomorrow and i need Help ... Calorimeter Experiment ! Homework Statement My groups is terrible and is basically refusing to do any work---that's the real problem My (other) problem is this: I have a piece of copper that I am using as a calorimeter, I'm placing it inside...

Anyone?

Homework Statement I'm trying to derive the \epsilon - NTU Expression for a double-pipe counter flow heat exchanger. I know what I need to do the only problem I am having is: I don't know how to algebraically go from ln( \frac{\Delta T2}{\Delta T1} ) = -UA ( \frac{1}{Ch} + \frac{1}{Cc} )...

nevermind I got it... I didn't make all the units match

okay so I'm home now and I've tried what was suggested but, I still don't get the right ans...: 510/1.75=8.30/(pi/4)*d^2 I used the reciprocals and got 1.75/510=(pi/4)*d^2/8.30 ... reduced and I got sqr root (4*8.30*1.75/pi510)=d ans:.5982 the book ans is 6.02... where did I go wrong?

Okay...thx the ans is going to be positive b/c it is a force...thx for all yall's help

okay so I would have sqr((8.25*7.6)/((PI/4))*510)=d

so I would have : ((pi/4)*510)/(8.25*7.6)=1/d^2 ...?

mechanics of matericals ... algebra question I'm currently in Mechanics of Materials and I have reduced my problem to something similar to: 510/7.6=8.25/((pi/4)*d^2) how do I solve for d? I have been given the answer (from the back of the book) but i don't remember how to solve for d...by...

simple math...just not for me I'm currently in Mechanics of Materials and I have reduced my problem to something similar to: 510/7.6=8.25/((pi/4)*d^2) how do I solve for d? I have been given the answer (from the back of the book) but i don't remember how to solve for d...by the way the...

okay so I've tried several other things and I still can't calculate entropy production ... I tried -entropy production=m1(cp*ln(T3/T1)-R*ln(P3/P1)+m2(cp*ln(T3/T2)-R*ln(P3/P2) but I don't get the answer my prof gave ... and even if I did how would I use my 'knowns' to calculate work?

How do I do/show that? Also how do I find δ? What equation do I use? How do I use the 2nd Law to find δ?