Approximately how massive is the Sun as compared to Earth?
A. 300 times
B. 3,000 times
C. one million times
D. 300,000 times
E. 100 times
Answer: D
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What is a stratosphere?
A) a lowest layer in the atmosphere B) a part of the atmosphere that absorbs optical light C) a part of the atmosphere that absorbs ultraviolet light D) a part of the atmosphere that absorbs x-rays E) the highest layer in an atmosphere
If the Q value of an endothermic reaction is –2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV. 2.greater than 2.17 MeV. 3.less than 2.17 MeV. 4.exactly half of 2.17 MeV.
A person has a mass of 45 kg. How much does she weigh?
A) 4.6 N B) 20 N C) 99 N D) 220 N E) 440 N
In our best current theory, the first quasars formed about:
A) 14.5 billion years ago. B) 13 billion years ago. C) 12 billion years ago. D) 11 billion years ago. E) 9 billion years ago.