In an AC circuit, the ratio of average current to maximum current is:
a. zero.
b. 0.5.
c. 0.707.
d. 1.0.
a
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When a light bulb is turned on, its resistance increases until it reaches operating temperature. What happens to the current in the bulb as it is warming up?
a. It stays constant. b. It increases. c. It decreases. d. It increases at first and then decreases.
Large deposits of gypsum and other evaporite minerals are evidence of
A) volcanic activity during the Cambrian period. B) dried up shallow seas from the Silurian period. C) seafloor spreading during the Permian period. D) glaciation during the Triassic period.
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.
The first steps of evolution off the main sequence are the same for both medium-mass and high-mass stars
a. True b. False Indicate whether the statement is true or false