The Roche lobe of a star in a binary star system:
A) resembles the ear of Edouard Roche, a French mathematician.
B) is, in terms of the star's gravity, its "zone of influence."
C) is the part of a rapidly rotating star that will eventually spin away to form planets.
D) is the accretion disk around the companion star.
E) leads to formation of rings, like around the jovian planets.
B
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An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
how long does it take to traverse the plates?
A. 2.00 ?s B. 2.00 ns C. 1.70 ns D. 1.80 ns E. 1.50 ?s
Which class of stars probably has too small a habitable zone for life to arise?
What will be an ideal response?
Dirty bombs may be less of a threat than people fear, because
A. once spread out, the rem level drops below the radiation illness threshold B. dirty bombs require plutonium, and that is hard for terrorists to obtain C. the radioactivity is too small to induce cancer D. the radiation does not actually get out of the bomb case, even when exploded
Resistance and Resistivity: A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 ? ? m. When this wire carries a current of 0.50 A, what is the voltage across its ends?
A. 0.0030 V B. 0.32 V C. 0.64 V D. 1.6 V