If an element has 15 protons, 16 neutrons, and 15 electrons, what is the atomic mass of the element?
A. 30
B. 15
C. 31
D. 16
E. none of the above
Answer: C
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Which of the following is true regarding fuel cell technology?
A. They are only about 40-45% efficient. B. They must receive a constant supply of water and oxygen. C. They must be recharged with an electrical current. D. They were first designed by NASA. E. A fuel cell stack providing all of the electricity for a typical home is not feasible because it would be too large.
Since the shift to floating exchange rates, what activity has become a big business?
A) international stock markets B) purchases using the internet C) trading in currencies D) international mortgage banking E) land speculation
Which of the following is NOT a contributing factor to the high mortality rates among Russian men?
A) cardiovascular disease resulting from high-fat diets and physical inactivity B) less financial resources for health expenditures as compared to the Soviet era C) exposure to radiation from Soviet-era nuclear waste which was improperly disposed D) high rate of tobacco use E) excessive consumption of alcohol
Object A is twice as warm as object B. Object A
A) emits twice as much energy as object B. B) emits half as much energy as object B. C) emits four times as much energy as object B. D) emits 16 times as much energy as object B.