AP Physics 1hardmcq1 pt
A 2.0 kg rock swings on a 1.5 m string in a vertical circle. At the top its speed is 5.0 m/s (g = 10 m/s²). The tension at the top is about
A.13 N
B.33 N
C.53 N
D.20 N
Explanation
Core Concept
T + mg = mv²/r: T = (2.0)(25)/1.5 − 20 = 33.3 − 20 ≈ 13 N.
Correct Answer
A13 N
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