The Jovian planets can be eliminated as hosts for life because:
A) they do not have an atmosphere.
B) they are too hot for liquid water to survive on the surface.
C) they have water in the form of ice on the surface.
D) they do not have solid surfaces.
D
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Potential of Point-Charges: Two +6.0-µC charges are placed at two of the vertices of an equilateral triangle having sides 2.0 m long. What is the electric potential at the third vertex, relative to infinity, due to these charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 54 kV B. 108 V C. 0 V D. 90 kV E. 27 kV
At peak brightness, the white dwarf supernova is approximately ________ times as luminous as the massive star supernova at peak brightness.
A) 1.5 B) 3 C) 10 D) 100
The half-life of 3H is 12 years. About how long does it take for 127/128 of a sample of that radionuclide to decay?
a. 7 years b. 11.9 years c. 12.1 years d. 84 years
The total electromagnetic power emitted by the Sun is 3.8 ×1026 W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 1010 m?
A) 3 × 10-5 N/m2 B) 3 × 10-7 N/m2 C) 3 × 10-8 N/m2 D) 3 × 10-4 N/m2 E) 3 × 10-6 N/m2