On a transmitter, a( sends modulated carrier waves into the air.

the answer is antenna

A transmitter is an electronic device which produces radio wave with the help of an antenna. Electromagnetic waves are generated by time varying electric currents which contains electrons flowing through a metal conductor called an antenna which change their direction and thus accelerates. An alternating current flowing in an antenna will create oscillating magnetic field around the conductor.If the frequency of the oscillations are high,the oscillating magnetic an electric field will move away into the air in the form of modulated carrier waves.

true tan speed = ang vel x radius

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.