A 3.5-m-diameter merry-go-round is rotating freely with an angular velocity of 0.77 rad/s . Its total moment of inertia is 1760 kg⋅m2 . Four people standing on the ground, each of mass 69 kg , suddenly step onto the edge of the merry-go-round. A) What is the angular velocity of the merry-go-round now?
B) What if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)?

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.

current flows in a wire

pretty sure it's false