Aerial photography was taken at a flying height h ft above average terrain.

if the camera focal plane dimensions are 9 x 9 in, the focal length is fand the spacing between adjacent flight lines is x ft, what is the percent sidelap for the data given in problem?

h 7000; f 88.90 mm; x 13,500

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.