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Monday, February 9, 2015
Saturday, February 7, 2015
What is heating and cooling?
Touch something hot and your senses immediately tell you to pull your hand away. hotness is about the amount of heat energy an object has.
a spark from a firework may be very hot but it will not hurt very much becuse it does not contain much heat energy/however,even though a cup of tea may not be very hot,it can still burn the tongue because it contains a lot of heat energy
Friday, February 6, 2015
refraction in different materials
when light enters a material at an angle, it changes direction because its speed changes. if the material is very dense, the light slows down more and so the refraction is greater
apparent depth
one of the effects of refraction is that the brain can be tricked into thinking that things are in a different place from where they really the bottom of a pool of water...
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