The effect of specific heat on energy invested
Edited BY: Helen Wolfson
Edit Date: 2016-05-24 06:20:54
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.

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

A more useful quantity is "specific heat capacity", which is the amount of heat required to change the temperature of one unit of mass of a substance by one degree. Specific heat capacity is, therefore,  has units of energy per mass per degree. Each material has different heat capacity. The specific heat of some materials is shown in the table below:


Specific Heat Table

Material

Specific Heat (j/kg 0C)

Air (nitrogen)

1.030

Aluminum

0.897

Sand

0.742

Diamond

0.510

water

4.186

Iron

0.449


Now that you know what specific heat capacity is, try answering the question below. Use the video for better understanding the question.


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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