When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants
a. 0.250
b. 0.500
c. 0.693
d. 1.00
e. 1.44
c
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The moons of Mars are believed to be
a. composed primarily of iron and nickel. b. composed primarily of frozen gases of water and carbon dioxide. c. orbiting Mars in a direction opposite to the direction that Mars rotates. d. formed from material ejected from Olympus Mons and other large volcanoes on Mars. e. captured asteroids.
Which of the following best describes what we mean by a habitable world?
A) a planet or moon that could support life, if any life happened to be on it B) a planet or moon with life C) a planet or moon that lies within its star's habitable zone D) a planet or moon on which humans could survive if we happened to go there
A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it 2.3 m from the floor?
A) 110 cm B) 11 cm C) 110 mm D) 140 cm
How would you describe the rapid variations in CO2 on the inset graph on the right?
A) The variations occur randomly every few years. B) The variations occur randomly every few months. C) The variations occur regularly every few years. D) The variations occur regularly every year. E) The variations occur regularly every few months.