The force of friction between an object and the surface upon is 30 N, an object that weighs 60 N is dragged across the surface. What is the coefficient of
friction?

Carbon 14 is a naturally occurring stable

What does si stand for, when referring to a system of measurement

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.