Consider the following statement, and explain whether or not it is sensible: NASA hopes to build a new telescope that will allow us to see 100 million light-years into the past
What will be an ideal response?
Not sensible: It uses light-years as a length of time.
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Helium fusion is called the triple-alpha process because
a. the helium nucleus is known as an alpha particle. b. it occurs very rapidly. c. it requires a temperature three times greater than that of hydrogen fusion. d. it is the third source of the primary fusion processes. e. each reaction produces three carbon nuclei.
The number of significant figures in 0.40 is
A) one. B) two. C) three. D) four. E) five.
When a solid melts
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.
A 47.0-kg person steps on a scale in an elevator. The scale reads 461 N. What is the elevator doing?
What will be an ideal response?