Which combination of elements below results in a metallic bond?

Which of the following would not be taken into consideration when describing the quality of a sound

Air enters a compressor operating at steady state at 1.05 bar, 300 k, with a volumetric flow rate of 93 m3/min and exits at 12 bar, 400 k. heat transfer occurs at a rate of 15.5 kw from the compressor to its surroundings. assuming the ideal gas model for air neglecting kinetic potential energy effects, determine the power in put in kw.

What is the coefficient of kinetic friction μk between the block and the tabletop?