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 increases.
B.
It increases, then decreases.
C.
It remains constant.
D.
It decreases.
It's C
1 answer
The electric company is supplying energy to the room and it is heating up. We hope she is using a CFL or LED lamp to minimize heating of the room and waste of energy.
4 answers