A center or an edge of the Universe would be a special place, contradicting the cosmological principle
a. True
b. False
Indicate whether the statement is true or false
True
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Applications to Astronomy: The cosmic background radiation corresponds to a temperature of about
A. 1.4 K. B. 2.7 K. C. 8.0 K. D. 20 K.
We can think of the high tide on the side of Earth opposite the Moon as a result of the Moon pulling Earth away from the water.
Answer the following statement true (T) or false (F)
The chemical properties of chlorine and bromine are similar because both
a. are nonmetals and they are close together in the periodic table. b. have seven valence electrons. c. have two electrons in the first shell. d. are in the same period.
A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 10^7 m/s, determine the recoil speed of the thorium nucleus