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quantumworld
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A long, straight, and massless rod pivots about one end in a vertical plane. In configuration I, two small identical masses are attached to the free end; in configuration II, one mass is moved to the center of the rod. What is the ratio of the frequency of small oscillations of configuration II to that of configuration I?
(A) (6/5)^1/2
(B) (3/2)^1/2
(C) 6/5
(D) 3/2
(E) 5/3
ok, here is my problem: now we have a pendulum that oscillates normally ( configuration I), and another one ( configuration II) that I have no idea how to calculate its frequency of oscillation. First I thought that the second configuration will have two normal modes, but I messed up, because this is a rod, so it is a rigid body problem .
the correct answer is A.
thank u so much
(A) (6/5)^1/2
(B) (3/2)^1/2
(C) 6/5
(D) 3/2
(E) 5/3
ok, here is my problem: now we have a pendulum that oscillates normally ( configuration I), and another one ( configuration II) that I have no idea how to calculate its frequency of oscillation. First I thought that the second configuration will have two normal modes, but I messed up, because this is a rod, so it is a rigid body problem .
the correct answer is A.
thank u so much
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