a 20kg box is attached to a rope what is the tension in the rope if the box moving up with constant velocity

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

How do we measure or think of speed in the united states?