g With aerodynamic resistance considered (using Eq. 2.42), SS= bbWW 2ggKKaa (1+ KKaaVV1 2 WW(bbµµ+ff±sinθθgg) ) = • For the same conditions but with bb ′ =0.85, Eq. 2.42 gives SS= bbWW 2ggKKaa (1+ KKaaVV1 2 WW(bbµµ+ff±sinθθgg) ) = • Now applying Eq. 2.47 (or Eq. 2.46 since GG=0) for the practical stopping distance, dd = VV1 2 2gg( aa gg±GG) = • In the first case, the difference is ; • In the case of 85% braking efficiency, the difference is .

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

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?