A 5 kg object moves in a horizontal circle of radius 3 m at a constant speed of 6 m/s. Find the centripetal force.
Answer and explanation
Correct answer: C. 60 N
- Step 1: Centripetal force F = m v^2 / r.
- Step 2: F = 5 x 6^2 / 3 = 60 N.
Answer
60 N.
Why not the others: '10 N' uses mv/r instead of mv^2/r; '540 N' multiplies by r instead of dividing; '30 N' includes a factor 1/2 from kinetic energy.
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