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P. 4180. A point-like body of mass m and of charge Q is initially at rest on the horizontal tabletop as shown in the figure and is given a v0 vertical, upward speed. There is a horizontal E electric field exerted on the object. With what speed does the object hit the table when it falls back, and what is the distance between the starting point and the point where it hits the table?

(4 points)

Deadline expired on 12 October 2009.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. $\displaystyle s=\frac{2E\vert Q\vert v_{0}^{2}}{mg^2},$ $\displaystyle v=v_{0}\sqrt{1+\left(\frac{2EQ}{mg}\right)^2}.$

Statistics on problem P. 4180.
 146 students sent a solution. 4 points: 88 students. 3 points: 33 students. 2 points: 8 students. 1 point: 6 students. 0 point: 5 students. Unfair, not evaluated: 6 solutions.

• Problems in Physics of KöMaL, September 2009

•  Támogatóink: Morgan Stanley