The rigid bar AD is supported by two steel wires, one of length 15 in and the other of length 8 in, and 1/16-in diameter with a modulus of 29e6 psi and a pin at bracket D. Assume that the wires were initially taut before load P was applied... a. Determine the additional tension in each wire when the 120-1b load P is applied at B b. Determine the deflection at point B C. Discuss why the wires are assumed to be taut (i. e. based on the information provided, what is your rationale for the assumption)

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

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?