A 12 kg aluminum toolbox is dropped from rest onto a large wooden beam. The box travel 0.2 m before contacting the beam. After impact, the box bounces 0.05 m above the beams surface. Approximately what impulse does the beam impart on the box?

A. 8.6 N. s
B. 12 N. s
C. 36 N. s
D. 42 N. s

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.

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.