Three galaxies, each of mass M = 4.0 × 10^41 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 10^22 m length. The magnitude of the force the other two galaxies exert on each galaxy is
a. 4.3 × 10^27 N.
b. 6.4 × 10^27 N.
c. 7.4 × 10^27 N.
d. 8.6 × 10^27 N.
e. 4.3 × 10^28 N.
C
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Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?
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In a diagram of electric field lines, what is represented by lines that are drawn closer together?
A. a more positive field B. a more negative field C. a stronger field D. a weaker field E. nothing (artistic license)