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Old Feb 28th 2010, 09:11 AM   #1
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could a student survive

While running a 70-kg student generates thermal energy at a rate of 1200 W. To maintain a constant body temperature of 370 C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of the student’s body, for what amount of time could a student run before irreversible body damage occurs? (Protein structures in the body are irreversibly damaged if body temperature rises to 440 C or above. The specific heat capacity of a typical human body is 3480 J/kg-K.). I tried using Q=msdeltheta but hung up.
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Old Mar 1st 2010, 05:27 AM   #2
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Hi binayakafle

I also used the same equation : Q = m c Δθ and I think I got the answer. Can you post what you've tried ?
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Old Mar 1st 2010, 08:57 AM   #3
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Q = m c Δθ =70*348*(44-37)=170520J

since given that , 1200J in 1 second
1 J in (1/1200) second
therefore,170520j in (1/1200)*170520=142.1 sec
Izz my answer matched with yours ? Is anything left to be solved. because i dont beleive the answer could come in these small steps since it was question of mark woth 15. Unless the question maker had tried to trick the candidate.
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Old Mar 1st 2010, 09:04 AM   #4
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A little mistake, 348 should be 3480. My work is exactly the same as yours.

Hm...15 points is indeed not suitable for this question because I think the small steps are the right steps.
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Old Mar 1st 2010, 09:33 AM   #5
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it was asked in physics olympaid preselection test in national level
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