Write general expressions for the electric and magnetic fields of a 1 ghz sinusoidal plane wave traveling in the +y direction in a lossless nonmagnetic medium with relative permittivity r = 9. the electric field is polarized along the x direction, its peak value is 6 v/m, and its intensity is 4 v/m at t = 0 and y = 2 cm

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?

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Different between right hand turning tool and left hand turning tool ?