One charge of +30 uC and another charge of an unknown value are separated 0.045m. They feel an attraction force of 2.5kN. Which is the value of the second charge?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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hope this