An object is moving with constant non-zero acceleration along the +x-axis. A graph of the velocity in the x direction as a function of time for this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
Answer: D
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Which of the following best describes the modern definition of a constellation?
A) a region of the celestial sphere B) a pattern of bright stars in the sky C) a Greek mythological figure D) a collection of stars that are near one another in space E) a group of stars that all lie at about the same distance from Earth
Which of the following statements is true of a bipolar flow?
A) It represents jets flowing in opposite directions away from a central object. B) It is similar to that of laminar and transient flows. C) It is not associated with Herbig-Haro objects. D) It is not associated with the asymptotic giant branch stars.
The radio lobes that are on each side of some radio galaxies and jets from them produce mainly
a. 21-cm radiation. b. synchrotron radiation. c. black body radiation. d. emission lies due to hydrogen. e. absorption lines due to hydrogen.
Important support for general relativity came from studies of the precession of the orbit of
A) Mercury. B) Venus. C) Earth. D) Mars. E) asteroids.