The kilowatt-hour is a unit of
a. power c. voltage
b. energy d. current
B
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Based on the given right ascensions and declinations, which of the following stars lies closest to the south celestial pole on the celestial sphere?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
We know the Sun rotates differentially by observing sunspots; as with Jupiter the solar equator rotates the fastest
Indicate whether the statement is true or false
Knowing that the atomic number of neon is greater than that of helium, at the same temperature and pressure, how does the speed of sound in helium gas compare to the speed of sound in neon gas?
A) greater in neon than in helium B) greater in helium than in neon C) the same in both gases D) depends on the frequency of the sound generated
A high f-number:
a. allows using a slower shutter speed. b. causes more spherical aberration. c. allows a larger depth of focus. d. is not related to any of the above options.