Investigate the squared-and-ground-ended helical compression spring shown below to see if it is solid-safe. If not, what is the largest free length to which they can be wound using ns 1.2? Wire diameter Outside coil diameter Free length Total coils Material
0.148 in 2.12 in 2.5 in 5.75 A227 hard-drawn steel

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.