A mass moves in a circle of radius at a constant speed of . What is the centripetal force (in N)?

Answer and explanation

Correct answer: B. 16

  1. Step 1: The centripetal force required to sustain circular motion of radius at tangential speed is given by .
  2. Step 2: Substitute mass , radius , and velocity : .
  3. Step 3: Calculating the terms yields .
Answer
16.
Why not the others: 64 omits dividing by radius (); 4 forgets to square the velocity (); 32 divides by 2 instead of radius 4.

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