One end of a post weighing 400n and with height h rests on a rough horizontal surface with μs=0.30. the upper end is held by a rope fastened to the surface and making an angle of 36.9∘ with the post. a horizontal force f⃗ is exerted on the post as shown

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)