A certain engine extracts 1300 J of heat from a hot temperature reservoir and discharges 700 J of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 46%
B) 54%
C) 86%
D) 27%
E) 13%
Answer: A
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Which of the following limit the ultimate world population?
a. The size of Earth b. The energy coming to Earth from the Sun c. The amount of land mass d. The amount of food available e. All of the above are limits to world population.
An experimental result that is statistically significant is:
a. likely to occur by chance alone b. unlikely to occur by chance alone c. scientifically significant or important d. the result of an experiment with only one variable e. influenced by sampling error
Which of these statements is true?
a. a battery produces ac and a generator produces dc b. a battery and a generator produce ac c. a battery and a generator produce dc d. a battery produces dc and a generator produces ac
One solar mass stars produce their energy by the set of nuclear reactions called the CNO cycle
Indicate whether the statement is true or false