What type of object only has magnetic energy when it is in a different object's magnetic field?

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

What sort of waves exhibit the doppler effect?