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?

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

The maximum shear stress and maximum flexural stress occur at the same location along a beam subjected to a non-uniform bending load. a)-trune b)- false