A particle of mass rests on a rough plane inclined at where , and is just on the point of slipping. Find the coefficient of friction.

Answer and explanation

Correct answer: C.

  1. Step 1: In limiting equilibrium: and with .
  2. Step 2: So .
Answer
.
Why not the others: is what you get if you invert the ratio. is what you get if you use instead of . is what you get if you use instead of .

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