How much heat is needed to increase the temperature of "1 kg"1 kg of foam by "2 K"2 K knowing that the specific heat of foam is "1200 J kg"^(-1)"K"^(-1)1200 J kg−1K−1 ?
1 Answer
Explanation:
The specific heat of a substance tells you how much heat is needed in order to increase the temperature of one unit of mass of that substance, usually
In your case, the specific heat of foam is given as
Now, you must figure out how much heat is needed to increase the temperature of
In this case, you know that you need
In other words, you will need
2 color(red)(cancel(color(black)("K"))) * overbrace("1200 J"/(1color(red)(cancel(color(black)("K")))))^(color(blue)("needed for 1 kg of foam")) = color(darkgreen)(ul(color(black)("2400 J")))
I'll leave the answer rounded to two sig figs.
