Considering both longevity and luminosity, which of these stars would be the most likely candidate for seeking extraterrestrial intelligence?
A) Spica, a B3 main-sequence star
B) Sirius B, a white dwarf
C) Antares, a M3 supergiant
D) 61 Cygni, a K2 main-sequence star
E) Barnard's star, a M5 dwarf
D
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A current-carrying wire of length 50 cm is positioned perpendicular to a uniform magnetic field. If the current is 10.0 A and it is determined that there is a resultant force of 7.5 N on the wire due to the interaction of the current and field, what is the magnetic field strength?
a. 1.8 × 10^–3 T c. 6.7 × 10^–3 T b. 1.5 T d. 0.60 T
A sunspot maximum occurred in the year 2015. If the solar cycle continues, the year of the sunspot maximum that immediately follows the 2015 cycle maximum will be _____
A) 2026 B) 2020 C) 2016 D) 2030
Each note on a piano keyboard has its own
A) pitch. B) loudness. C) wavelength. D) amplitude. E) none of the above
The synodic period of the moon
a. is about 27.32 days long. b. is the period of time for the moon to orbit Earth once with respect to the stars. c. is the period of time between successive eclipses at a given location on Earth. d. is the period of time from when the moon rises until the moon rises again the next night. e. none of the above