8
lesson pretestMultiple Choice

Pretest

Question 8 • Physics I

A ball that has a mass of 0 point 2 5 kilograms spins in a circle at the end of a 1 point 6 m rope. The ball moves at a tangential speed of 12 point 2 m/s What is the centripetal force acting on the ball?

Answer
A
1 point 9 cap n
B
23 bold cap n
C
59 cap n
D
93 cap n

Explanation

Centripetal force is calculated with F = mv²/r. Using a mass of 0.25 kg, speed of 12.2 m/s, and rope length (radius) of 1.6 m gives F = 0.25 × (12.2)² ÷ 1.6 ≈ 23 N. Therefore, the centripetal force is 23 N, choice B.

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