A conducting sphere of radius 20 cm is charged so that the electric field reaches 
at its surface. What is the potential at the surface of the sphere?
a. 
b. 
c. 
d. 
e. 
d.
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Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Velma observes that Mort's next tick occurs
A) before or after or at the same time as her own tick, depending on Velma's precise speed relative to Mort. B) at the same time as the tick on her clock. C) before her own clock ticks. D) after her own clock ticks. E) only when the moon is full.
As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.38c c. –0.38c b. –0.20c d. not given
Two charges are separated by a certain distance. If the magnitude of each charge is doubled the force on each charge is
a. halved. b. doubled. c. tripled. d. quadrupled.
Neptune:
A) is blue and has active cloud formations. B) does not have a moon of its own. C) has rings that are easily detectable from Earth. D) is made up of an atmosphere that is free of methane.