Homework Help: science

Posted by Caro on Sunday, May 10, 2009 at 7:47pm.

In a cd player, where is the potential energy stored?
Where does does it change form?
Where is the kinetic energy released?

Also

What happens to the mass in the leaves of a tree when the tree burns??

PLEASE ANSWER ALL OF THE QUESTIONS!!

science - drwls, Monday, May 11, 2009 at 6:25am
A CD player, when playing, gets the energy required to turn the disc, operate a disc-reading laser, and emit an electrical sound signal to speakers, from an electrical source. That electrical energy could come either from a wall outlet or batteries.

When trees burn, the mass of the leaves and other parts is converted to CO2 and water vapor (H2O). Some ash will remain.

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