<span>answer under the link: http: //briskrange.com/7gAl</span>
Considering the magnetic force is providing the centripetal force,
we get, mv^2/r = qvB
so, r = mv/qB
as the Kinetic energy, K of the particle is given by.5mv^2
so, v = sqrt(2K/m)
substituting the in radius equation,
<span>r = m*sqrt(2K/m)/qB
r = sqrt(2Km)/qB</span>
It’s 12 km
Because you multiply 8x1.5 and you get the answer.
-- The object's weight is different on each planet, while it is
apparently weightless during the trips in between.
-- On some if not all of the three planets, the object needs to be
surrounded by protection from heat, cold, poisonous gases, or
solar radiation.
-- If the object is any kind of life form, then its circadian rhythm is
all screwed up, and it is having trouble sleeping.
-- The object has accumulated a huge balance of frequent flier miles.
