Find the focal length of a lens of power-2.0D . What type of lens is this ?

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

The mini-refrigerator fire was most likely caused by what type of wiring?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt