In the attachment there is a density column where there is colour Question: tell me why is the red at the bottom of the density column if it is the least dense

Why should seat belts not be mandatory quick plz

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

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?