An elephant is dragging a tree trunk along a horizontal surface by means of an attached rope which makes an angle of 30° with the horizontal. The tension in the rope is 4000 N.
(i) Determine the horizontal force exerted by the rope on the tree trunk. [3464 N]
(ii) Determine also the vertical component of the force exerted by the rope on the tree trunk. [2000 N]
(Please kindly attach vector diagrams as well)

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.

The slope of a velocity time graph over any interval of time gives the during that interval

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?