The following acceleration vs time plots show data gathered from an automobile fitted with
an accelerometer. In each case the driver ac
celerated to cruising speed and then slammed
on the brakes. In one case the car is equipped
with an antilock braking system (ABS), while
in the other the car is not. ABS tends to
prevent skidding and did just that in this ex
periment, allowing a more rapid deceleration.

Work = force × a. work b. energy c. distance d. momentum

More solar radiation is absorbed by earth’s surface than by

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?