In the context of binary systems, a _____ is an explosion involving a white dwarf
A) nova
B) sunspot
C) comet
D) zenith
A
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A__________is a small nebula that varies irregularly in brightness, evidently associated with star formation
A) Herbig-Haro object B) brown dwarf C) Bok globule D) T Tauri star
When an electron collides with a positron the two particles
A) fuse to form a heavier particle B) bounce off each other C) are destroyed, producing a pair of high-energy gamma rays D) are destroyed, producing another pair of particles
A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
a. at the 40-cm mark b. at the 45-cm mark c. at the 50-cm mark d. at the 55-cm mark e. at a position not given
In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
a. the potential of the nearest battery is the potential at the junction. b. there are no transformations of energy from one type to another in a circuit loop. c. capacitors tend to maintain current through them at a constant value. d. current is used up after it leaves a junction. e. charge is neither created nor destroyed at a junction.