The effect of specific heat on energy invested
Edited BY: shaul arama
Edit Date: 2016-05-23 20:39:16
Question:

In the summer time, most of the people like spending time along the beach. At the beach, the cool water is much more inviting than the hot sand, even though the sun warmed them both up since the morning.


The video and the table below might help to answer the following question.


You should know that the heat capacity of substance in the amount of heat required to change its temperature by one degree, and has units of energy per degry.

A more usefull quantity is "specific heat capacity", which is amount of heat required to change the temperature of one unit os mass of a substance by one degree.

Specific heat capacity is, therefore, an intensive variable and has units of energy per mass per degree.

specific heat capacity [J/g * 0C]

air 1.03

Alominum 0.897

Diamond 0.510

Iron 0.449

Polyethylene 1.79

Sand 0.742

Water 4.186


The specific heat of some materials is shown in the table above.

Question:

In order to raise the temperature of the sand and water to the same level, where should one invest more energy?

 


 


Question Created By: haya zinno birk
Creation Date: 2016-05-01 14:20:41
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