The ball is released from rest when the thread makes an angle of 32 with the vertical.

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The ball is released from rest when the thread makes an angle of 32° with the vertical. How fast is it moving when the thread is vertical?

A ball with a net charge of +450 nC and mass 0.75 g is suspended from a thread of length 12 cm in a uniform electric field of 8.0 kV/m downward. Do not ignore gravity. The system acts like a pendulum but with a downward electric force added to the gravitational force.

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