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Kinetic Friction

Which of these mathematical expressions have the appropriate dimensions of the coefficient of kinetic friction?

Please see attached for mathematical expressions.

Type the letters corresponding to correct answers alphabetically. Do not use commas. For instance, if A, B, and D have the appropriate dimensions, enter ABD.

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I would say the answer is:

ACE

However there is a subtle point.
Since the dimensions of d1 and d2 are not specified in the problem, the answer depends on this bit of information. The main point is that the coefficient of kinetic friction ...

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170 words.

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