An experiment is conducted such that an applied force is exerted on a 5 kg object as it travels across a horizontal surface in which frictional forces are NOT considered to be negligible. A graph of the net force
exerted on the object as a function of the object's distance traveled is shown. How could a student use the
graph to determine the network done on the object?

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire.to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.