A car travels a displacement of 298 m North in a time of 12.7 s. Calculate the average velocity of the car. a. 0.043 m/s South
b. 0.043 m/s North
c. 23.5 m/s North

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your 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?