Dark energy is made of
A) weak force fields that were created during the big bang.
B) fast moving "gluons" that were created during the big bang.
C) an unknown material that has never been directly observed in laboratories.
D) slow-moving "magnetons" that were created during the big bang.
E) invisible electromagnetic fields.
D
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Indicate whether the statement is true or false
The cosmological principle is the ultimate extension of the Copernican principle to the entire universe, in that there is no center at all
Indicate whether the statement is true or false
A car is driven 1200 m north at 20.0 m/s and then driven 1600 m east at 25.0 m/s. What are the magnitude and direction of the displacement for this trip?
a. 1400 m, northeast b. 2000 m, 36.9° north of east c. 2000 m, 53.1° north of east d. 2800 m, 36.9° east of north e. 2800 m, 53.1° east of north
In beta minus decay, the number of protons in the nucleus
A) is decreased by 1. B) is decreased by 2. C) is increased by 1. D) is increased by 2. E) remains unchanged.