The average speed of Daisy running a distance of 2 km in a time of one-half hour is
A) 1 km/h.
B) 2 km/h.
C) 4 km/h.
D) more than 4 km/h.
Answer: C
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The ____________ was a large cyclonic storm in the atmosphere of Neptune observed by Voyager 2
Fill in the blank(s) with correct word
The force of friction on a sliding object is 50 N. The applied force needed to maintain a constant velocity is
A) more than 50 N. B) less than 50 N. C) 50 N.
What change slowly occurs during the main-sequence lifetime of a star?
A) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. B) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.
Experimentally, strange particles can be produced in abundance, but they decay relatively slowly. This occurs because strangeness
a. is conserved in both their production and decay. b. is conserved in their production but not in their decay. c. is conserved in their decay but not in their production. d. is not conserved in either their production or their decay.