Which of the following a magnet NOT attract?
A. iron
B. plastic
C. cobalt
D. nickel

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

In an experiment, how can i change human errors? be specific.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.