Two point charges of magnitude + 4.00 ?C and - 6.00 ?C are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively
Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges? A) 0.200 m
B) 1.78 m
C) - 0.180 m
D) - 1.78 m
E) 0.180 m
D
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a. True b. False Indicate whether the statement is true or false
Size of the Nucleus: A proton is projected at a stationary 
Ra aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the nuclear force on the proton is negligible. The initial kinetic energy of the proton, in MeV, is closest to:
A. 8.7 MeV. B. 5.8 MeV. C. 2.9 MeV. D. 13 MeV. E. 17 MeV.
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a. True b. False Indicate whether the statement is true or false