At what speed would a 100. meter long spaceship appear to be 60. meters long?
A) 2.4 × 103 Km/s
B) 0.24 m/s
C) 24. Mm/s
D) 240. Mm/s
E) 2.4 Gm/s
D
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Four identical point charges (+4.0 ?C) are placed at the corners of a square which has 20-cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?
A. +2.9 J B. +3.9 J C. +2.2 J D. +4.3 J E. +1.9 J
A particular object appears to be red. The reason it appears red is:
1.It absorbs only red frequencies as they hit. 2.It reflects only red frequencies as they hit. 3.It absorbs red frequencies more than other frequencies. 4.It reflects red frequencies more than other frequencies. 5.It emits red frequencies more than other frequencies. 6.Not enough information.
The angle of incidence
A) must equal the angle of reflection. B) is always less than the angle of reflection. C) is always greater than the angle of reflection. D) may be less than or equal to the angle of reflection. E) may be greater than or equal to the angle of reflection.
The spectacular image called "Einstein's Cross" is direct evidence of which of the following phenomenon