Homework Help: PHYSICS 102E

Posted by Akitsuke on Sunday, December 14, 2008 at 7:02am.

(0.2kg)(4190J/kg.degree Celsius)(T-70 degrees Celsius)+(0.1kg)(390J/kg.degree Celsius)(T-20 degrees Celsius)= 0.

how will I equate it to get the final Temperature? I don't understand how did they get the answer of T=67.8 degrees Celsius.

can someone explain it? Pls. I have an Exam tomorrow and I need to understand it. thanks

PHYSICS 102E - drwls, Sunday, December 14, 2008 at 7:40am
Just do the algebra to get the final T. Stick the units (degrees C) on later.
838.2*(T-70)+ 39(T-20)=0
(838.2+39) T = 58764 + 5800
T = 64564/878.2 = 73 C

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