Question

An electrically neutral model airplane is flying in a horizontal circle on a 2.5-m guideline, which...

An electrically neutral model airplane is flying in a horizontal circle on a 2.5-m guideline, which is nearly parallel to the ground. The line breaks when the kinetic energy of the plane is 50 J. Reconsider the same situation, except that now there is a point charge of +q on the plane and a point charge of -q at the other end of the guideline. In this case, the line breaks when the kinetic energy of the plane is 52.6 J. Find the magnitude of the charges.

q=_____________C

Homework Answers

Answer #1

Suppose the centripetal force in case 1 is Fcmax

Fcmax = mv12 / 2    , KEmax = mv12 / r

The centripetal force in case 2 is Fc' = Fc + Fq where Fq is the extra force by the charges.

Now, at the breaking point, Fcmax + Fq = mv1' 2 / r

Hence, KE'max - KEmax = m(v1' 2 - v12) / 2 = 2.6 J

and Fq = m(v1' 2 - v12) / r

=> kq2 / r2 = m(v1' 2 - v12) / r

=> q2 = mr(v1' 2 - v12) / k = 2(KE' - KE)r / k = 5.2(2.5)/(9*109) = 14.44*10-8

=> q = 3.8 * 10-4C

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