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Question
The specific heat of ice is 0.5 calories/gram°C.

20 grams of ice will require _____ calories to raise the temperature 1°C.

0.5
1.0
5.0
10

Answer
The heat needed Q to change the temperature of a substance is given by:
Q=m*c*DT  where m is the mass of the substance, c is the specific heat (the heat needed to change 1.0 grams of the substance by 1.0 degrees.) and DT is the resulting change in temperature.
Therefore the heat needed will be:
Q=20g*0.5cal/g*oC*1oC=10cal

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James J. Kovalcin

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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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