The Local Group of galaxies is dominated by the presence of spiral galaxies
Indicate whether the statement is true or false
F
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A total shadow is called
A) an umbra, and a partial shadow a penumbra. B) a penumbra, and a partial shadow an umbra. C) neither of these
An open circuit consists of a 12-?F parallel plate capacitor charged to 200 V and a 10-? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
A. 1.2 ?A. B. 2.4 × 10?4 A. C. 2.4 mA. D. 10 A. E. 20 A.
During a solar eclipse, the umbra moves across Earth's surface generally from
a. east to west. b. west to east. c. south to north. d. north to south.
Hubble's law is the major basis for the concept that the universe is
a. static. b. evaporating. c. contracting. d. expanding.