Woot. Okay everybody. Drinking a doppelsticke now. Just in case anybody out there is nostalgic for college and smarter than me, I've got a story problem for you. It's been fighting me and my homebrew buzz for a while now this morning.
A steel rod (rho= 7860 kg/m3) has a length of 1.56 m. It is bolted at both ends between immobile supports. Initially there is no tension in the rod, because the rod just fits between the supports. Find the tension that develops when the rod loses 5.00e+03 J of heat.
What a pain in the ass. The following I know:
F=Y(dL/L0)A
dL=(alpha)L0dt
Q=mcdt
m=(rho)hA
L0=1.56 m
Q=5000 J
alpha=12E-6
Y=2E11
c=452
Ready, set, go! Because, I mean, really, if you can't come to HBT to find bored physics geeks to help you with your homework, where can you go?