A disk of radius $$\(1 \mathrm{~m}\)$$ and rotational inertia $$\(I=\)$$ $$\(0.5 \mathrm{~kg} \cdot \mathrm{m}^{2}\)$$ is free to rotate, but initially at rest. A blob of putty with mass $$\(0.1 \mathrm{~kg}\)$$ is traveling toward the disk with a speed of $$\(10 \mathrm{~m} / \mathrm{s}\)$$, as shown in the preceding figure. The putty collides with the outermost portion of the disk and sticks to the disk. What is the angular momentum of the combined disk-putty system after the collision?

A.
\(5 \mathrm{~kg} \cdot \mathrm{m}^{2} / \mathrm{s}\)
B.
\(1 \mathrm{~kg} \cdot \mathrm{m}^{2} / \mathrm{s}\)
C.
\(0.5 \mathrm{~kg} \cdot \mathrm{m}^{2} / \mathrm{s}\)
D.
\(0 \mathrm{~kg} \cdot \mathrm{m}^{2} / \mathrm{s}\)
Physics 1
AP
College Board
Exam No:AP Physics 1 Problem Set 1 Year:2024 Question No:14

Answer:

B

Knowledge points:

7.3 Angular Momentum and Torque
7.4 Conservation of Angular Momentum

Solution:

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