Magnetic Levitation (MagLev) trains “float” on powerful magnetic fields to reduce friction. Aluminum is widely use on MagLev trains. Why is aluminum so widely used and what other materials could possibly be used?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

Wiy doeres rere okhn a pump whon working betwon the same pressure range?