A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 30.0 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 0.0
b.
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Multiple-Object Accelerating Systems: A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the masses are gently released from rest, how long does it take for the 3.0-kg mass to rise by 1.0 m?
A. 0.41 s B. 0.74 s C. 0.82 s D. 1.8 s E. 0.90 s
Which of the following can never be negative?
A) acceleration of gravity B) displacement C) instantaneous speed D) average velocity E) instantaneous velocity
The Moon, Mercury, and Mars do not have plate tectonics because
A) they have cooled so rapidly that they do not have enough internal convection to break up their thick crusts B) they have no oceans for subduction and seafloor spreading to occur in C) impacts have filled in the plate boundaries essentially turning the process off D) their crusts have dried up and thickened so the crust cannot be broken up into plates
The ________ model for pulsars explains why there are a lot more neutron stars than pulsars, since most are not at the correct angle for us to observe their pulses
A) lighthouse B) Hawking C) Bell D) relativistic E) Einstein