The fastest auto race in the United States is the Busch Classic at Daytona. In 1987, the winner's average speed
was about 318 km/h. If the kinetic energy of the winning
car was 3,800,000 J, what was the mass of the car and
its driver?
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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?