What is the universe mostly made of?
A) ordinary matter, including intergalactic gas
B) dark matter
C) electromagnetic radiation
D) neutrinos
E) None of the above.
E
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Clusters of galaxies are distributed in space ____
a. homogenously b. isotropically c. in long, narrow filaments surrounding empty voids d. statically e. in bubbles surrounded by empty walls
The main reason for the large inefficiency of the automobile is
A) the kinetic principle. B) friction in the moving parts. C) the first law of thermodynamics. D) the second law of thermodynamics. E) unburned hydrocarbons.
Assuming g = 10 m/s2 and that air resistance is negligible, in 1/2 second a ball dropped from rest will fall
A. 0.3 m. B. 1.0 m. C. 0.8 m. D. 2.25 m. E. 1.25 m.
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26s-1)t]. What is the velocity of the mass when t = 0.815 s?
A) - 13.3 cm/s B) 13.3 cm/s C) 8.02 cm/s D) - 8.02 cm/s E) 0 cm/s