Roentgens are used to measure the amount of:

uranium
fuel burned
radiation
hydrogen isotopes

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

What is creep? what is stress relaxation?

What are the major differences between injection molding and extrusion?