Two point charges of magnitudes + 5.00 ?C, and + 7.00 ?C are placed along the x-axis at x = 0 cm and x = 100 cm, respectively
Where must a third charge be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 4.58 cm
B) 45.8 cm
C) 50 cm
D) 9.12 cm
E) 91.2 cm
B
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A) rads. B) rems. C) joules. D) none of the above
Who provided evidence for the existence of a nucleus of an atom?
A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car’s instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car’s weight?
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
A Young's double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any?
a. The separation decreases because the frequency of the light decreases in the water. b. The separation decreases because the wavelength of the light decreases in the water. c. The separation stays the same as it is the same experiment independent of the medium. d. The separation increases because the wavelength of the light increases in the water.