1、SAT物理求解释

2、急~一道SAT化学题&物理题

s coefficient of volume expansion due to heating, β,and its coefficient of linear expansion,α?

(A)β=α (B)β=3α (C)β=α+α*α (D)β=α*α*α (E)β=3*α*α*α

正确答案是B,我想知道为什么

希望有好心人能帮我解决这两道题阿~谢谢喽~", 'contentText': "1、Identify the element with the greatest first ionization energy.

(A)Ce (B)C (C)Cl (D)Ca (E)Cs 答案是B,st有谁知道为什么吗？

2、Which of the following equations best states the relationship between a material's coefficient of volume expansion due to heating, β,and its coefficient of linear expansion,α?

(A)β=α (B)β=3α (C)β=α+α*α (D)β=α*α*α (E)β=3*α*α*α

正确答案是B,我想知道为什么

希望有好心人能帮我解决这两道题阿~谢谢喽~", 'supplyRich': '

3、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。然后解释。答案太诡异了。实在捉摸不透。谢谢~

4、一道SAT物理题

Electrical appliances are usually grounded in order to :

为什么家用电器要接地？

A. prevent the buildup of an overloaded circuit防止负载电荷

B. prevent the buildup of static charges on their sufaces.防止其表面产生静电荷

那为什么是静电而不是电流呢？以前以为是电流通过人与大地形成的回路，导致人触电的，难到不是这样么？

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