Two Blocks of Masses M1 and M² Are Connected by a Light

question 36

Multiple Choice

Two blocks of masses m1 and m² are connected by a light cord that passes over a pulley of mass M, as shown. Block m² slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
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Use this exhibit to answer the following question(s) .
-The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is

• A)the same at all times.
• B)proportional to l1, the length of string from the pulley to m1.
• C)proportional to l2, the length of string from the pulley to m².
• D)conserved because the Earth doesn't move.
• E)proportional to the speed of the blocks.

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