What is Sgr A??
A) a source of bright radio emission in the center of our galaxy
B) a source of bright ultraviolet light near the center of our galaxy
C) the brightest star in the constellation Sagittarius
D) the bulge at the center of our galaxy
E) a source of bright X-ray emission coming from the entire constellation of Sagittarius
A
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A good heat conductor is
A) a poor insulator. B) a good insulator. C) neither of these
Two charges lie on the x axis, +2q at the origin, and ?3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
A. 1.0 m. B. 2.0 m. C. 2.5 m. D. 3.0 m. E. 4.0 m.
In a collision the total ____________ is the same before and after
Fill in the blank(s) with correct word
When a bar magnet is broken in half, the strength of the four new poles relative to pole strength before breaking is
A) less than half. B) half. C) the same. D) somewhat more.