A) Evaluate (724 mm )/(37 s ) to three significant figures and express answer in SI units using an appropriate prefix.

Express your answer to three significant figures and include the appropriate units.

B)

Evaluate (26 ms )(0.052 Mm )/(348 mg ) to three significant figures.

Express your answer using three significant figures.

(26 ms )(0.052 Mm )/(348 mg ) = Mm⋅s/kg
C)

Evaluate (2.88 mm )(456 Mg ) to three significant figures.

Express your answer using three significant figures.

(2.88 mm )(456 Mg ) =
km⋅kg

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

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.