An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. a 50- year-old runner can cover the same distance with an average speed of 4.27 m/s. how much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner?

The plum pudding model of the atom state that ?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

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?