anonymous
  • anonymous
How much heat is required to solidify 2.0 kg of liquid copper? (see table attached inside!) A. - 4.1 × 10^5 J B. - 1.0 × 10^5 J C. 1.0 × 10^5 J D. 4.1 × 10^5 J *thank you:)
Physics
chestercat
  • chestercat
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anonymous
  • anonymous
Michele_Laino
  • Michele_Laino
the requested amount Q of heat is given by the subsequent formula: \[\Large Q = Cm\] where: C= 2.05*10^5 J/Kg Furthermore, since we are dealing with the solidification process, of our sample of copper, then we have to consider Q as a negative quantity, because the heat left the sample of copper
anonymous
  • anonymous
okay! so 2.05*10^5 * 2 = 410000 and you said it is negative? so would our answer be choice A? - 4.1 * 10^5 J ?

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Michele_Laino
  • Michele_Laino
yes! That's right!
anonymous
  • anonymous
woo! thank you:D
Michele_Laino
  • Michele_Laino
thank you!! :D

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