Electron velocity and unit vector notation

[4eleven]

Homework Statement

An electron has an initial velocity with an x component of zero, a y component of 17.2 km/s, a z component 20.7 km/s, and a constant acceleration of 1.95 x 1012 m/s2 in the positive x direction in a region in which uniform electric and magnetic fields are present. If the magnetic field has a magnitude of 378 µT and is in the positive x direction, find the (a)x, (b)y, and (c)z components of the electric field. Give your answers in V/m

Homework Equations

F = q(E + v x B) = ma
E = (ma/q) + B x V

The Attempt at a Solution

E = [(9.11E-31 kg*1.95E12 m/s) / -1.60E-19 C] + (378 uT)i x [(17.2 km/s)j + (20.7 km/s)k]

this may seem silly, but I can't remember how to solve for each x, y, and z component now...

 

[Irid]

Search the web for cross product, for example here:

http://en.wikipedia.org/wiki/Cross_product#Matrix_notation"