I have two questions for physics. 1.A simple pendulum with mass of 0.25kg, and l

Question

I have two questions for physics. 1.A simple pendulum with mass of 0.25kg, and length f 1.00m, the displacement is 15 degrees. what is its max acceleration? I know the max acceleration happens when the displacement at its max, after then that i'm stuck. 2. When a sound source and observer is traveling towards each other, at the point where they meet, what is the frequency of the sound in the observer's ear? I think the answer would be the original frequency, but Doppler effect does not depend on distance. I'm confused.

Explanation / Answer

1. f = 1/(2 * pi) * (g / L)^1/2 frequency of pendulum w = 2 * pi * f = (g / L)^1/2 angular frequency A simple pendulum oscillates in simple harmonic motion a = - w^2 * A maximum acceleraton for simple harmonic motion 2. I would tend to agree with your answer since the motion of the source would be perpendicular to the observer

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