一道SAT物理题WhichofthefollowingcanactuallylowertheinternalevergyofaroomA.afanB.arefregeratorwithitsdooropenC.arefregeratorwithitsdoorclosedD.anairconditionerinthemiddleofaroomE.anairconditionerpartiallyexpos

Question

一道SAT物理题
Which of the following can actually lower the internal evergy of a room
A.a fan
B.a refregerator with its door open
C.a refregerator with its door closed
D.an air conditioner in the middle of a room
E.an air conditioner partially exposed to the outside.
你们先选吧.答案太诡异了.实在捉摸不透.

Answer 1

应该是E
A 电扇只能产生风,并不能降温,人感到凉快只是因为自身皮肤的水分蒸发时带走了热量
剩下的BCD里 冰箱和空调原理差不太多,都是通过物理方法把这个地方的热量带到其他地方,如果冰箱整个都在室内,不管门是开着还是关着,都只是在屋子内部进行热量转移,没有效果,而且自己还会产生多余的热量.E是正常的空调,可以将室内的热量转移到室外,从而达到目的.