Magnetism Question Can't figure it out

[harrism1]

Homework Statement

In a certain region, the Earth's magnetic field has a magnitude of 5.5 x 10-5 T and is directed north at an angle of 40° below the horizontal. An electrically charged bullet is fired north and 19° above the horizontal, with a speed of 700 m/s. The magnetic force on the bullet is 3.9 x 10-10 N, directed due east. Determine the bullet's electric charge, including its algebraic sign (+ or -).

Homework Equations

F=qvBsintheta

The Attempt at a Solution

3.9E-10N= q* 700m/s(V)*5.5E-5T (B)*sin19
=3.1E-8N

 

[rl.bhat]

Angle between v and B is ...?

 

[harrism1]

59degrees?

 

[rl.bhat]

Substitute this value in the problem instead of 19 degrees.