Seven seconds after a brilliant flash of lightning, thunder shakes the house. Approximately how far was the lightning strike from the house?
A) much closer than one kilometer
B) about one kilometer away
C) about two kilometers away
D) much farther away than two kilometers
E) It is impossible to say.
C
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The carbon-nitrogen-oxygen (CNO) cycle works best in temperatures:
A) lower than 10,000,000 K. B) higher than 16,000,000 K. C) higher than 11,000,000 K but lower than 12,000,000 K D) higher than 13,000,000 K but lower than 15,000,000 K
The mass number of an atom is determined by the weight of:
a. neutrons and protons b. neutrons and electrons c. protons and electrons d. protons only e. neutrons only
If an object isn’t accelerating, no external force is acting on it
1.True 2.False
After what evolutionary stage does a star become a white dwarf?
a. Protostar b. Pre-main sequence c. Main sequence d. Giant