What is the source of the magnetic field in a permanent magnet? A) the spin and orbital motion of electrons
B) long-range electric currents that are always present in iron
C) the motion of iron nuclei
D) net electric charge at the poles of a magnet

How will the system respond to a temperature increase?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

What is the relationship between the direction of motion of the balloon and the wind currents