The solid ball with radius of 0.6m is made of plastic having a density of 48 kg/ml. Determine the tension in the cable AB
if the ball is submerged in the water at 0.9m.

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.