anonymous
  • anonymous
The amount of heat needed to raise 250 g of a substance by 15 K is 2,930 J. What is the specific heat of the substance (J/(kg*K))? A. 0.78 B. 11,000 C. 780 D. 1.1 × 10^7 **not 100% sure, but is this choice C? 780?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1432746745005:dw| the equation... in case i didn't write it clearly :P
Michele_Laino
  • Michele_Laino
here we have to use this formula: \[\Large Q = cm\Delta T\] Q is the heat , c is the specific heat, and T is the absolute temperature
anonymous
  • anonymous
okay! so what would be plugged in? :/

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Michele_Laino
  • Michele_Laino
so, we can write: \[\Large c = \frac{Q}{{m\Delta T}} = ...\frac{{Joules}}{{Kg \times Kelvin}}\]
anonymous
  • anonymous
okay! so 2930/(kg*15)? is that right? and solve for kg?
Michele_Laino
  • Michele_Laino
no, we have to compute this: \[\Large c = \frac{Q}{{m\Delta T}} = \frac{{2930}}{{0.250 \times 15}} = ...\frac{{Joules}}{{Kg \times Kelvin}}\]
anonymous
  • anonymous
ohh okay!! so we get 781.333333 so about 780?
Michele_Laino
  • Michele_Laino
that's right!!
anonymous
  • anonymous
yay!! thank you:D
Michele_Laino
  • Michele_Laino
:D

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