Which voltage is not caused by a source of emf?
a. the voltage across a charged capacitor
b. the voltage across two copper-iron junctions at different temperatures
c. the voltage across the terminals of a dry cell battery
d. the voltage from an electric generator
a
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The period-luminosity relation for Cepheid variables was discovered in 1908 by
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 10%. B) 20%. C) 50%. D) 80%. E) need more information
During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because
a. all heavy nuclei are unstable. b. no stable nuclei exist with masses of 5 or 8 hydrogen masses. c. the helium nucleus is unstable. d. the temperature and density were too low. e. no nuclei heavier than helium could form since there weren't any electrons formed.
If the date is April 21, what zodiac constellation will be visible on your meridian at midnight?
A) Leo B) Aquarius C) Libra D) Aries