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# A train is passing by and you notice a ball is hanging from the ceiling. You...

1. A train is passing by and you notice a ball is hanging from the ceiling. You also notice that the ball appears to make an angle with the vertical. If the mass of the ball is mb, and the train has an acceleration a0 to the right, find an equation that relates the angle the string makes with the vertical with the acceleration of the train. What acceleration must the train have in order for the string to make an angle of 85 degrees? Compare this to the acceleration typically experienced in cars (around 4m/s2).

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