The satellite most critical to the study of the formation and structure of the universe is ________, which detected the ripples that led to galaxies
A) WMAP B) Fermi C) Planck D) HST E) COBE
C
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A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.
RXJ1800, a galaxy, lies very near in the sky to the bright star Vega. What is the best explanation for them appearing close together?
A) Their random motions have caused RXJ1800 and Vega to drift to within a few light-years of each other. B) They coincidentally lie along the same line of sight. C) Vega must have recently formed in RXJ1800 and been ejected. D) Vega orbits the center of mass of RXJ1800.
The analysis of Martian meteorites found on the Earth show that they contain
A) only tantalizing hints of possible life. B) fossilized remains of multi-cellular insects. C) fossilized remains of small, mammal-like creatures. D) bacteria with DNA very different from bacteria on Earth. E) bacteria with DNA closely related to bacteria on Earth.
Potential of Point-Charges: Three point charges, -2.00 ?C, +4.00 ?C, and +6.00 ?C, are located along the x-axis as shown in the figure. What is the electric potential (relative to infinity) at point P due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. -307 kV B. +307 k V C. -154 kV D. +154 kV E. 0.00 kV