Eudoxus of Cnidus (408–355 BCE), a student of Plato's, applied the principle of heliocentric motion to produce a mathematical description of the motions of the Universe
a. True
b. False
Indicate whether the statement is true or false
False
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The sunspot cycle averages about 11 months
Indicate whether the statement is true or false
Which of the following histories are in the correct order of occurrence?
A) The Big Bang, then the expansion starts, then the Sun and stars make the first elements heavier than helium. B) The Big Bang, then the expansion starts, then stars make the first elements heavier than helium, then the Sun forms. C) The Big Bang happens simultaneously with the start of the expansion of the universe, then the Sun and stars make the first elements heavier than helium. D) The Big Bang happens simultaneously with the start of the expansion of the universe, then stars make the first elements heavier than helium, then the Sun forms.
The process of removing an electron from a stable nucleus is known as
a. ionization. b. Doppler broadening. c. collisional broadening. d. a red shift. e. quantum mechanics.
You are asked to design a metal alloy for a high temperature application. What type of metal alloy phase diagrams should you consider first for this application?
(a) Continuous solid solution (b) Eutectic (c) Compound formation (d) Peritectic