A 6 kg object moves in a horizontal circle of radius 8 m at a constant speed of 4 m/s. Find the centripetal force.

Answer and explanation

Correct answer: A. 12 N

  1. Step 1: Centripetal force F = m v^2 / r.
  2. Step 2: F = 6 x 4^2 / 8 = 12 N.
Answer
12 N.
Why not the others: '3 N' uses mv/r instead of mv^2/r; '768 N' multiplies by r instead of dividing; '6 N' includes a factor 1/2 from kinetic energy.

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