How does the direction of the lift on a plane compare with its weight as it flies at a constant speed and altitude? a. lift acts downward, and weight acts upward. b. both lift and weight act downward. c. both lift and weight act upward. d. lift acts upward, and weight acts downward.

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What property is a characteristic of a substance that can be observed and does not change the identity of the substance

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?