Radiant energy reaching the Earth from the sun is not sufficient to keep the Earth's surface temperature comfortable for life. Of the following, the most likely source of the additional thermal energy is from
a. fusion of hydrogen nuclei in the Earth's core.
b. fusion of high Z nuclei in the Earth's core.
c. fission of radioactive nuclei inside the Earth.
d. fission of radioactive nuclei in cosmic rays.
e. deflection of radioactive nuclei in cosmic rays.
c
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Two billiard balls having the same mass roll toward each other at the same speed. What is the net momentum of the two-ball system?
A) 0 kg?m/s B) 10 kg?m/s C) not enough information
Spherical Mirrors: An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is
A. real and upright. B. real and inverted. C. virtual and upright. D. virtual and inverted.
Felsic definition
What will be an ideal response?
How is Titan different from all the other Jovian satellites?
a. Titan has frozen water on its surface b. Titan has a heavily cratered surface. c. Titan has a thick atmosphere. d. Titan is the largest moon in the Solar System. e. Titan has a young, very reflective surface.