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Finding q to then raise an object, hoping someone can check this work 
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#1
Sep2313, 01:57 AM

P: 17

I think ive got this but not 100% sure.
if a horse can heat 11.6kg ice water T=273k to 355K in 2.5 hours how high could it raise a 217kg weight in 2.5 min? heres what ive done q_{p}=mc_{p,s}dt=(1.16E4 g)(4.18 J K^{1}g_{1})(82K)=3.976E6 J (3.976E6 J/2.5hr)(1hr/60min)(2.5min)=6.627E4 J h=w/mg=6.627E4 J/((217 kg)(9.81m s^{2}))=31.1m does this seem legit? we working with all this rev/irrrev work and transfer and im getting really mixed up by simple stuff but if p=const then it would be irreversible right? any suggestions would be great if im way off track Thnaks 


#2
Sep2313, 03:13 AM

Admin
P: 23,732

Looks OK to me (I haven't checked the numbers, just skimmed the logic), but your comment about reversibility/irreversibility makes me wonder if there is not some context to the question which makes it more complicated. But if treated literally as posted  its OK.



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