What is the shape of the curve for curvature radius vs. refractive index with a constant focal length? what happens to the required index of refraction as the radius becomes arbitrarily large or arbitrarily small? what conclusions can you draw about the material requirements of manufacturing small spherical lenses for use in personal electronic devices?

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

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

Which of these metals are magnetic?