The terrestrial planet with the most moons is ____________________
Fill in the blank(s) with correct word
Mars
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If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:
A) more than 10 times as bright as Earth at its brightest. B) more than 25 times as bright as Venus at its brightest. C) more than 10 times as bright as Venus at its brightest. D) more than 25 times as bright as Earth at its brightest.
Which of the following stars is hottest?
A. G B. F C. M D. O E. B
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant,
and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is
?
?
a.
0.
b.
?/2.
c.
?.
d.
3?/2.
e.
2?.
What is a short circuit?
a. A path with a very high resistance. b. A path with a very low resistance. c. A circuit with a very short path. d. Any incorrectly wired circuit. e. An electrical circuit that behaves unpredictably.