大學物理一題(有關單位或物理量的測量)?

2015-09-26 6:06 pm

共有四小題：

In a particular set of experimental trials, students examine a system descried by the equation:

Q/Δt=[kπd²(Th-Tc)]/4L

In this trials, all quantities except d and Δt are constant.
(a) If d is made three times larger, does the equation predict that Δt will get larger or smaller?
(b) What pattern of proportionality of Δt to d does the equation predict?
(c) To display this proportionality as a straight line on a graph,what quantities should you plot on the horizontal and verticalaxes?
(d) What expression represents the theoretical slope of thisgraph?

有點難以理解題目在問甚麼~"~

回答 (1)

Marksix

2015-09-26 6:40 pm

(a) When d gets larger, Δt will get smaller 因為兩者是成反比例的，D是在EQUATION的分母，而Δt 是另一方的分子
(b) d² is proportion to 1/Δt, or Δt is proportion to 1/d²
(c) To get a straight line, you have to make the quantities in proportion
Therefore, horizontal axis = Δt
vertical axis = 1/d²
(Not sure if these two are real ans)
(d) 1/(d²Δt), You have to explain what this is.

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