An asteroid has a perihelion (the orbit's closest approach to the Sun) of 1.5 AU and a period of revolution of 8.0 yr. What is its greatest distance from the Sun (its aphelion)?
a. 8.0 AU
b. 6.5 AU
c. 4.0 AU
d. 2.5 AU
b
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An air mass forming over the desert regions of
northern Africa would be classified as a) mP. b) cT. c) mT. d) cP.
If an object's orbital velocity is greater than its escape velocity, then the shape of the path is a/an __________________ and the orbit is____________
a. ellipse, closed b. circle, closed c. parabola, open d. parabola, closed
That the radio lobes radiate synchrotron radiation indicates that
a. high-speed electrons are spiraling through a magnetic field. b. the source of the radio jets must be a black hole. c. the source of the radio energy is rotating rapidly. d. the central galaxy must be a giant elliptical galaxy. e. the central galaxy must rotate about two nearly perpendicular axes.
Which of the following is NOT true about adding animations to your website?
A. You can purchase ready-to-use animated elements from Animation Factory. B. Restrictions on usage for animated elements vary. C. Some animations place restrictions on use in commercial websites. D. When using an open format animation, screen readers and adaptive devices still may require a plug-in.