Earth is like a bar magnet. what does this mean about its magnetic poles?

question 5 options:

a. there is only a magnetic north pole.

b. there are both magnetic north and south poles.

c. there is only a magnetic south pole.

d. there are two magnetic north poles.

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

If the temperature were raised very high, classically what would we expect the heat capacity per object to be for this one-dimensional system? give a numerical value. chigh t = __ j/k/object (one reason for the discrepancy is that the high-temperature limit assumes that the number of oscillators is large (n > > 1), which is not the case in this tiny system.)

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?