PLEASE What is the magnetic force on a proton that is moving at 3.8 x 107m/s up through a magnetic field that is 0.72 T and pointing toward you? The charge on a proton is 1.6 x 10-19 C. Use F = qvx B sine.
A. 6.1 x 10-12 N right
B. 4.4 x 10-12 N left
C. 4.4 x 10-12 N right
D. 6.1 x 10-12 N left

15.3 cos 65 degrees trig

a displacement distance is size of displ

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.