Eva is in a closed, dark room. she uses her arm muscles to turn on a lamp. when she moves her hand closer to the lamp, the light heats her hand. the light bounces off the pages of a book and into her eyes.
if this room is a closed system, what happens to the total amount of energy in the room?
a.
it remains constant.
b.
it decreases.
c.
it increases, then decreases.
d.
it increases.
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