(Solved): The forming department of a plastics factory produces a continuous plastic sheet \( 8 \mathrm{~m} ...

The forming department of a plastics factory produces a continuous plastic sheet \( 8 \mathrm{~m} \) wide and \( 4 \mathrm{~mm} \) thick at a speed of \( 6 \mathrm{~m} / \mathrm{s} \). The surface temperature of the plastic sheet is \( 90^{\circ} \mathrm{C} \) and one surface of the sheet is exposed to a flow of motor oil at a temperature of \( 30^{\circ} \mathrm{C} \) and a speed of \( 10 \mathrm{~m} / \mathrm{s} \) perpendicular to the direction of the movement of the sheet. The width of the engine oil cooling section is such that it passes through a fixed point on the plastic plate in \( 3 \mathrm{~s} \). Determine the rate of heat transfer from the plastic sheet to the air. 1. Miceiv yedo