Ask your own question, for FREE!
Physics 19 Online
OpenStudy (anonymous):

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. D. It increases, then decreases.

OpenStudy (anonymous):

@Greg_D

OpenStudy (anonymous):

Even if the room is a closed system, i think energy is getting in to the room trough the lamp, since i guess the source of electric power is not inside the room.... with this assumtion made... energy increases at least until she turns the lamp off :)

OpenStudy (abhisar):

@jakematt24 , What do you think it should be?

OpenStudy (anonymous):

i was thinking a or b to be honest

OpenStudy (anonymous):

if it is a closed system, energy can't go out.

OpenStudy (anonymous):

good point

OpenStudy (abhisar):

Since the room is a closed system, no energy can escape from inside the room and no energy can enter from outside the room. Since, the lamp is inside the room and is constantly emitting energy in form of heat and light and no energy can escape outside, the energy inside the room will continue increasing.

OpenStudy (anonymous):

ok, thanks

OpenStudy (anonymous):

exactly!

OpenStudy (anonymous):

@Abhisar can you give @Greg_D a medal plz

OpenStudy (anonymous):

can u help w/ one more

OpenStudy (anonymous):

Which statement correctly describes the gravitational potential energy of the pendulum based on this diagram? A. It is greatest when the bob is in the rest position. B. It is greatest when the bob is at its maximum amplitude. C. It is greatest at 25% of the period length. D. It is greatest at the point where the arm meets the pivot point.

OpenStudy (abhisar):

Have already given one :-)

OpenStudy (abhisar):

One question per post (-:

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
euphoriiic: I drew more people !! ud83eudd17.
1 hour ago 40 Replies 3 Medals
euphoriiic: I drew markk ud83eudd17.
3 hours ago 34 Replies 2 Medals
LOLIAteYourMom: u2212243 = u22129(10 + x)
5 hours ago 0 Replies 0 Medals
Bubblezz: Art for @jeromeccv
5 hours ago 13 Replies 3 Medals
Bubblezz: Art for @jeromecv
10 hours ago 0 Replies 0 Medals
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!