AP Physics 1mediummcq1 pt
A ball swings on a string in a horizontal circle, the string angled at 30° below horizontal (r = 0.87 m, m = 0.40 kg, g = 10 m/s²). If the tension is 8.0 N, the ball's speed is about
A.3.9 m/s
B.7.8 m/s
C.2.0 m/s
D.15 m/s
Explanation
Core Concept
T cos 30° = mv²/r: v² = (8.0)(0.866)(0.87)/0.40 = 15.1, so v ≈ 3.9 m/s.
Correct Answer
A3.9 m/s
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