Two stars both have parallaxes of 0.023", but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?
A) Star B must be ten times more luminous.
B) Star A is both 100× brighter and larger than star B.
C) Star A is both 100× brighter and more luminous than star B.
D) Star A must be ten times closer.
E) Nothing, since we do not know their absolute magnitudes.
C
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To explain gravity, general relativity says that matter tends to ________ space in its vicinity
Fill in the blank(s) with correct word
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A) 6 ohms. B) 6 amperes. C) 6 joules. D) 6 watts. E) 6 newtons.
Slate is metamorphosed
A) granite, a foliated rock with alternating layers of dark platy minerals and lighter granular minerals. B) shale, a foliated rock composed of very small particles and flakes of mica. C) marble, a foliated rock with water-tight crystals. D) limestone.
Simple Harmonic Motion: The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?
A. 30.5 µs B. 15.3 µs C. 95.8 µs D. 0.191 ms E. 9.71 µs