A10 m^2 plane-wall with a thickness of 1m dissipates heat to ambient air through its two surfaces on the left and right, respectively. the thermal conductivity of the wall is = 20 w/m*k . the convection heat transfer coefficient at its external surface ℎ = 20 w/(m^2)k . the measured surface temperature is 50 °c. the ambient air temperature is 0 ℃. (1) draw a schematic figure of this wall and have all parameters known clearly presented; (2) find the heat dissipated from this wall to ambient air; (3) find the maximum temperature within this wall;