Find the rim tension and the bending stress in the rim of a flywheel, the section ofwhich is rectangular, 30 cm wide and 15 cm thick and mean diameter 240 cm. it runs at 300 rp. m. and has 6 arms. assume that owing to stretch ofthe arms the bending stress in the rim segment is 2/3 rd of the value obtained on the assumption that the rim segments are straight built in beams. p=7800kg/m^3

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.