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# specfic heat stuff watch

1. hey just wanted to see what you guys thought of my answer to this question...

i get 0.282 kg for the mass of steel that must be contained in the steel brake drums.

what do you guys think?

-Sarah
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2. I think you're a few orders of magnitude out, when you consider the size of the average drum break. 200g really isn't a lot of steel.

Have a look at your units, maybe.
3. hmm.. i was thinking that i might have done something like that... can anyone confirm what the actual answer is?
4. A quick guess makes me think about 28kg maybe?

Would work it out, but I'm at work.

Whoops!
5. lol, fair enough :P

Thanks morals_officer!
6. no no, i know what i did :P, forgot to square v in the KE formula! :P
7. Get 6.26kg in tha end?

dKE = 1/2 mv^2 [d meaning delta]
dKE = 1/2 * 1400 * (80000/(60*60))^2
dQ = dKE
dQ = 345, 679

m = dQ/(c * dT)
m = 345,679/((0.11*4.184*1000)* 120)
m = 6.26kg
8. yeah i got 6.26 , lol good ol square of the velocity

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