The mass of a visual binary pair of stars can be obtained from
a. the time in years for them to orbit one another.
b. the size of their orbit.
c. their apparent magnitudes.
d. both the time in years for them to orbit one another and the size of their orbit.
d
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Dimensional Analysis: Using dimensional analysis, which one of the following equations is dimensionally correct? In these equations, x has units of meters, t has units of seconds, v has units of meters per second, and a has units of meters per second2.
A. x = v/t B. v = 2ax C. t2 = x/a D. x2 = 2av E. x = at
Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.
Total lunar eclipses always occur
a. at the time of new Moon. b. at the time of full Moon. c. during either equinox. d. during either solstice. e. at the time that the Sun is directly overhead.
Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will
A) come to the same exact focus as orange light. B) reduce the effects of atmospheric turbulence. C) provide worse angular resolution than orange light. D) provide better angular resolution than orange light. E) allow dimmer stars to be observed.