Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter.
B) its density remains constant over time, so it is not important in the early Universe.
C) combined with dark matter, it will ultimately produce a closed universe.
D) that it was revealed with Type II supernovae distances in the late 1990s.
E) that it makes up 90% of all the matter and energy in the whole universe.
B
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Stars in the Galactic disk came billions of years before stars in the Galactic halo
Indicate whether the statement is true or false
A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.
In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life B) all four DNA bases used in life C) complex carbohydrates D) simple proteins
An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 ms. What is the magnitude of this acceleration?
a. 2.5 km/s2 b. 0.80 km/s2 c. 1.6 km/s2 d. 1.3 km/s2 e. 3.2 km/s2