GREPhysics.NET: GR0177 #59

GR0177 #59

Problem

GREPhysics.NET Official Solution

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Electromagnetism $\Rightarrow$ }LC Circuit

The form for a simple harmonic oscillator is $m\ddot{x} + kx =0$ , which one can obtain from Hooke's Law. Comparing this to the LC circuit equation $L\ddot{Q}+Q/C=0$ , one sees that $L \Leftrightarrow m$ and $1/C \Leftrightarrow k$ and $Q \Leftrightarrow x$ . This is choice (B).

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Comments

carl_the_sagan
2008-11-07 19:48:26

A really cheesy way is to totally disregard the question and just look at the answers. Typically on a question like this they are going to have to repeat the correct value for each column a few times.

so "m" is repeated in L, "1/k" is repeated in C, and "x" is repeated in Q. The only answer which lines all these multiple-occurring rows is B.

Granted this has nothing to do with physics, but this isn't about physics, its about getting the right answer.

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