Problem 6.7: for a bronze alloy, the stress at which plastic deformation begins is 275 mpa (40,000 psi), and the modulus of elasticity is 115 gpa (16.7 ×)what is the maximum load that may be applied to a specimen with a cross-sectional area of 325 mm2(0.5 in.2) without plastic deformation? (b)if the original specimen length is 115 mm (4.5 what is the maximum length to which it may be stretched without causing plastic deformation?

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

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?