The arrangement is composed of four 6.0 mF capacitors. What is the capacitance of the combination?
A. 24.0 mF
B. 4.5 mF
C. 8.0 mF
D. 9.0 mF
E. 12.5 mF
B. 4.5 mF
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Length Contraction: A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The length of the train, as measured by a stationary observer on the ground,
A. approaches infinity. B. increases due to the motion. C. decreases due to the motion. D. is not affected by the motion.
Which of the following hypothetical discoveries would be most surprising given our current theory of how stars and planets are born?
A) A star system has 5 terrestrial planets and 3 jovian planets, with all the terrestrial planets orbiting in one direction all the jovian planets orbiting in the opposite direction. B) A star system has 12 planets, 3 of which do not seem to fit either the terrestrial or jovian categories. C) A star system has 20 planets. D) A star system with 7 planets, 2 of which rotate in a direction opposite to their orbital directions.
A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW
If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
One target of the UN Millennium Development Goals that has successfully been reached involved cutting in half the number of people who lack access to
a. public education. b. information technology. c. international trade. d. safe drinking water.