Two equal point charges Q are separated by a distance d. One of the charges is released and moves away from the other due only to the electrical force between them. When the moving charge is a distance 3d from the other charge, what is its kinetic energy?

What will be an ideal response?


Answer: Q2/6π ε0d

Physics & Space Science

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The temperature of outer space is

A) zero. B) about 2.7 kelvin. C) meaningless. D) none of the above

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Consider an equilateral triangle of side 20. cm. A charge of +2.0 ?C is placed at one vertex and charges of -4.0 ?C are placed at the other two vertices. Determine the magnitude and direction of the electric field at the center of the triangle

What will be an ideal response?

Physics & Space Science

A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket. How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)

A) 1800 km B) 1200 km C) 3600 km D) 4800 km E) 2400 km

Physics & Space Science

A candle is 49.0 cm in front of a concave spherical mirror of radius of curvature 70.0 cm. What are the image distance and the magnification, respectively?

a. -20.4 cm, +0.417 c. +20.4 cm, -0.417 b. +122.5 cm, -2.50 d. +122.5 cm, +2.50

Physics & Space Science