A proton moves eastward in a region of space where a uniform magnetic field points north and has a magnitude of 5.0 ✕ 10-5 T. What velocity must the proton have for the magnetic force to just cancel the gravitational force?

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distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y