Which of the following is NOT a compound?
A) air
B) ammonia
C) water
D) salt
E) all are compounds
Answer: A
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The direction of the rotation of Venus is exceptional because it is in a(n) ________ direction
Fill in the blank(s) with correct word
Which event marks the birth of a star?
A) Formation of the planetary nebula B) Fusion of hydrogen atoms into helium atoms C) Collapse of an interstellar cloud D) Formation of a photosphere E) Instability in an interstellar cloud
Why do the predicted consequences of the special theory of relativity seem so strange to most of us?
A) because they are self-contradictory, making it impossible to make any sense of them B) because they are obvious only at speeds that we never experience in our daily lives C) because they contradict the well-tested ideas of Newton's laws of motion D) because they affect only subatomic particles and not big things like people
A cup of water is scooped up from a swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and the swimming pool
A) TPool is greater than TCup, and the U is the same. B) TPool is less than TCup, and the U is the same. C) TPool is equal to TCup, and UPool is greater than UCup. D) TPool is equal to TCup, and UPool is less than UCup. E) TPool is equal to TCup, and UPool is equal to UCup.