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F = ma (Final Problems)
Rotation
FMA-2020A-18 · 2020A F = ma (AAPT)

2020 F = ma Exam A — Question 18

A massless rigid rod is pivoted at one end, and a mass M is at the other end. Originally, the rod rotates frictionlessly about the pivot with a uniform angular velocity such that the mass M has speed v. The rotating rod collides with another mass M at its midpoint, which then sticks to the rod. After the collision, what is the kinetic energy of the system? v M M 1 M v2 4 1 (B) M v 2 3 7 (C) M v2 18 2 (D) M v 2 5 1 (E) M v 2 2
Source: Question 18, 2020 F = ma Exam A, © 2020 American Association of Physics Teachers (AAPT) and the U.S. Physics Team. Adapted by PhysicsTrainer: reformatted into a separate question and answer choices for online multiple-choice practice; any shared setup from nearby questions is repeated here. Not affiliated with or endorsed by AAPT or the U.S. Physics Team.