Observational evidence tells you that as a nova explosion begins, _____
A) a cloud of debris ejects into space
B) matter settles inward onto the surface of a white dwarf and forms a layer of unused nuclear fuel
C) dense gas comes toward you at a few thousand kilometers per second
D) the spectral lines change to emission lines
C
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Alpha Centauri A and B have an average orbital separation of about 23 AU and a period of about 80 years. Approximately what is the sum of their masses? If we presume that Alpha Centauri A is a star like our Sun, what is Alpha Centauri B's mass?
What will be an ideal response?
Consider an RLC circuit that is driven by an AC applied voltage. At resonance,
A) the peak voltage across the resistor is equal to the peak voltage across the inductor. B) the peak voltage across the resistor is equal to the peak voltage across the capacitor. C) the peak voltage across the capacitor is greater than the peak voltage across the inductor. D) the current is in phase with the driving voltage. E) the peak voltage across the inductor is greater than the peak voltage across the capacitor.
Which is not a phase of matter?
A) solids B) liquids C) gases D) vacuum
The gravitational field on the surface of the earth is 
mass of the earth is 
kg, radius of the earth is
meters)
A. 3.40 N/kg. B. 6.20 N/kg. C. 9.80 N/kg. D. 10.1 N/kg. E. 20.3 N/kg.