Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding q to then raise an object, hoping someone can check this work

  1. Sep 23, 2013 #1
    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

    qp=mcp,sdt=(1.16E4 g)(4.18 J K-1g-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/irr-rev 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

  2. jcsd
  3. Sep 23, 2013 #2


    User Avatar

    Staff: Mentor

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for Finding raise object
How do I find the work done in an adiabatic process?