Which of the following statements about the greenhouse effect is true?
A) The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide.
B) A weak greenhouse effect operates on Mars.
C) Without the naturally occurring greenhouse effect, Earth would be too cold to have liquid oceans.
D) One result of an increased greenhouse effect on Earth may be an increased number of severe storms.
E) All of the above are true.
E
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LR Circuits: As shown in the figure, a circuit consists of a resistor R = 22 ? in series with an ideal inductor L = 31 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. At time t = 5.0 s, what is the emf across the inductor?
A. 7.6 V B. 7.0 V C. 6.3 V D. 8.2 V E. 8.9 V
A converging lens will cause parallel rays of light to
A. Bend to meet at the focal point of the lens. B. Remain parallel C. Bend as though coming from the focal point of the lens. D. Scatter in random directions.
Which of the following situations represents a car whose speed is increasing?
A) A car covers equal distances in shorter and shorter times. B) In equal times, a car covers shorter and shorter distances. C) A car covers equal distances in equal times. D) A car takes longer and longer times to cover equal distances. E) None of the above.
A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground. What is the magnitude of the ball's velocity just before it hits the ground?
A) 1.22 m/s B) 6.79 m/s C) 7.45 m/s D) 9.14 m/s E) 4.58 m/s