Two equal point charges of magnitude 4.0 ?C are situated along the x-axis at x1 = -2.0 m and x2 = -2.0 m. What is the electric potential energy of this system of charges?
A) -36 mJ
B) 36 mJ
C) 0 J
D) -72 mJ
E) 72 mJ
B
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A sound source of 100 watts radiates sound uniformly in all directions. The intensity of the sound at a distance of 4.00 m is
A. 0.301 
B. 0.353
C. 0.497
D. 0.535
E. 0.621
What are the standard candles used to determine that the universe is accelerating?
A: spiral galaxies B: elliptical galaxies C: Type Ia supernovae D: light bulbs E: Type II supernovae formed from the death of massive stars
A single slit illuminated with a 500 nm light gives a diffraction pattern on a far screen. The 5th minimum occurs at 7.00° away from the central maximum. At what angle does the 18th minimum occur?
A) 26.0° B) 1.94° C) 5.05° D) 0.44°
The brightest stars in a young open cluster will be
A) massive blue main-sequence stars. B) Cepheid variables. C) yellow main-sequence stars like the Sun. D) T-Tauri variables. E) red giants.