A uniform linear charge density of 7.0 nC/m is distributed along the y axis from y = 2 m to y = 5 m. Which of the following integrals is correct for the magnitude (in N/C) of the electric field at y = 0 on the y axis?
A.
B.
C.
D.
E.
Answer: A
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Consider an electron in a hydrogen atom. How does the wavelength ? of an energy eigen function (as measured around the circular band) depend on the energy E associated with that eigen function?
A. ? ? ?E?
B. ? ?
C. ? is independent of E.
D. ? ? 
E. ? ? 1/?E?
The resultant force R (in newtons) for the force system shown in the figure is:
(A) 29.5i 1 36.4j – 81.4k
(B) 229.5i – 36.4j 1 78.3k
(C) 236.4i 1 29.5j 1 81.4k
(D) 239.3i 1 36.4j 1 122.2k
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact. B) of injuries suffered from direct hits of pieces of the asteroid or comet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes worldwide.
If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present. B. There were more ellipticals in the past and would be spirals at present. C. Things would have had a larger mass in the past than at present. D. They would have been destroyed by supernovae explosions by the present time. E. The galaxies were more irregular and patchy in the past than they are at present.