G A 8998 kg elevator is moving 4.4 m/s down. The tension in the elevator cable is 77,792.4 N. Determine the acceleration of the elevator (state the appropriate mks units). Also determine if the elevator is speeding up, slowing down, or maintaining a constant speed.

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.