RC Circuits: A circuit contains a 2.0-M? resistor in series with an uncharged capacitor. When this combination is connected across an ideal battery, the capacitor reaches 25% of its maximum charge in 1.5 s. What is its capacitance?
Fill in the blank(s) with the appropriate word(s).
2.6 µF
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a. lens b. dish c. mirror d. antenna e. computer
Which of the following best describes the greatest known value for index of refraction?
A. 1.732 B. 1.999.... (just shy of 2) C. 2.000... (2 exactly) D. a value greater than 2 but not greater than 3 E. a value greater than 3
Current: How much charge must pass by a point in a wire in 10 s for the current in the wire to be 0.50 A?
A. 20 C B. 2.0 C C. 5.0 C D. 0.050 C
A starburst galaxy gets this name because
A) it contains far more x-ray bursters than our Milky Way Galaxy. B) it has many stars bursting out of its disk toward intergalactic space. C) it is forming stars so fast that the starburst phase of life must be temporary. D) it contains so many stars that the galaxy's gravity cannot retain them in their orbits.