A planet is closest to the Sun in its elliptical orbit when it is at
A) perigee
B) aphelion
C) apogee
D) perihelion
D
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Centaurus A is a radio galaxy that has a visible galaxy at the center. This central elliptical galaxy of Centaurus A is encircled by a ring of gas and dust, different from most elliptical galaxies. The dust ring orbits about an axis that is perpendicular to the axis of rotation of the elliptical galaxy. What does this suggest about this central elliptical galaxy of Centaurus A?
a. The radio jets have caused the dust disk to be driven around the elliptical galaxy. b. There are at least two black holes at the center of the elliptical galaxy. c. Centaurus A is probably the result of a merger of an elliptical galaxy and a spiral galaxy. d. Dust is produced as the jets interact with the intergalactic medium. e. Elliptical galaxies often contain dust that forms a disk along their rotation axis.
To observe a visual binary, we must measure radial velocities
a. True b. False Indicate whether the statement is true or false
An object that completes 20 vibrations in 10 seconds has a frequency of
A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) 200 hertz.
When two or more capacitors are connected in series across a potential difference,
A) the potential difference across the combination is the algebraic sum of the potential differences across the individual capacitors. B) each capacitor carries the same amount of charge. C) the equivalent capacitance of the combination is less than the capacitance of any of the capacitors. D) All of the above choices are correct. E) None of the above choices are correct.