Q1 a 20 g rifle bullet travelling 215 ms buries itself in a, Ask an Expert

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Q1. A 20 g rifle bullet travelling 215 m/s buries itself in a 3.7 kg pendulum hanging on a 2.8 m long string, which makes the pendulum swing upward in an arc. Find out the horizontal component of the pendulum's displacement.

Q2. When two point charges are a distance R apart, their potential energy is -2.00 .How far (in terms of R) should they be from each other so that their potential energy is -6.00?

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