A uniform magnetic field of magnitude B=1.2 teslas is directed toward the bottom of the page in the -y direction.  At time t=0, a proton p in the field is moving in the plane of the page with a speed v=4 x 10^7 meters per second in a direction 30 degrees above the +x axis.
a.) Calculate the magnetic force on the proton at t=0
b.) With reference to the coordinate system shown above on the right, state the direction of the force on the proton at t=0
c.) How much work will the magnetic field do on the proton during the interval from t=0 to t=0.5 seconds?