The resolution of Olbers' paradox suggests that it gets dark at night because
a. the universe is not infinite in age.
b. the universe is static.
c. the universe is closed.
d. a and b
e. all of the above
A
You might also like to view...
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? 1 Ci = 3.7 × Bq
A) 5.8 × 109 B) 8.5 × 108 C) 6.3 × 108 D) 3.2 × 109 E) 2.4 × 109
How does the explosion of a nuclear bomb provide evidence for the theory of relativity?
A) The mass of the bomb when it explodes is much greater than its normal mass. B) bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation. C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates. D) The bomb converts rest-mass energy into thermal energy in accord with E = mc2, which is part of the theory of relativity.
Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures
What will be an ideal response?
A spring with spring constant k = 800 N/m is extended 12 cm from its equilibrium position. A spring with 6.0 cm extension from equilibrium will have the same potential energy as the first spring if its spring constant is
a. 200 N/m. b. 400 N/m. c. 800 N/m. d. 1 600 N/m. e. 3 200 N/m.