Traveling at an initial speed of 11.5 x 10^6 m/s, a proton enters region of constant magnetic field of magnitude 1.5 T. If the proton's initial velocity vector makes an angle of 30 degrees with the magnetic field, compute the protein's speed 4 seconds after entering the magnetic field.

Question

perl · Answer

F = qVxB , 
|F| = qV*B*sin(theta)

perl · Answer

F = ma , 
i dont know what else to use

aaronq · Answer

and you've tried those?

perl · Answer

google says 
mass of proton is 1.67 x 10^-27 kg

perl · Answer

q = 1.6 x 10^-19 C

perl · Answer

so if F = ma , 
F = qVBsintheta,
ma = qV*Bsintheta
a = qV*Bsintheta/ m  ?

perl · Answer

then multiply by time duration

aaronq · Answer

that looks good, if it doesn't work out, post this in the physics section