A series RLC circuit has a 150-? resistor, a 6.00-mH inductor and a 0.200-?F capacitor connected across a 120-V rms ac source at 15.0 kHz. What is the phase angle of the circuit?
A) 47.3°
B) 0°
C) 45.0°
D) 90.0°
E) 73.7°
E
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Which type of binary gives information about the star sizes in addition to the combined masses?
A. eclipsing binary B. spectroscopic binary C. visual binary D. apparent binary E. astrometric binary
When material expanding away from a star in a binary system leaves a star's Roche lobe,
a. the material will start to fall back toward the star. b. all of the material will accrete on to the companion. c. the material is no longer gravitationally bound to that star. d. the material will increase in temperature an eventually undergo thermonuclear fusion. e. c and d.
Imagine we've discovered a planet orbiting another star at 1 AU every 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months. What can we infer about this planet?
A) It is more massive than Earth. B) It is less massive than Earth. C) It has the same mass as Earth. D) We cannot answer the question without knowing the mass of the star. E) We cannot answer the question without knowing the mass of the moon.
Stromatolites are structures created by
a. algae. b. brachiopods. c. sea worms. d. trilobites.