Space-time will be flat if
a. the universe is expanding.
b. the universe is accelerating.
c. the average density of the universe is equal to the critical density.
d. the universe is finite.
e. the universe is homogeneous and isotropic.
C
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You are holding your physics book, pushing upwards on it with the palm of your hand. The reaction to this force is the force on __________ by __________
Fill in the blank(s) with correct word
For the ion He+, what is the energy of the ground state?
A. -13.6 eV B. -27.2 eV C. -54.4 eV D. -6.80 eV E. -3.40 eV
Which of the following was believed by Aristotle as a first principle?
A) Earth was flat. B) The heavens were perfect. C) The Sun was at the center of the Universe. D) Heavenly objects moved in a circular path at varying speeds.
A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.