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{"ops":[{"insert":"Puffin birds which are similar to penguins have a height of around 30 cm and radius of 8 cm when standing on land. Treating a puffin as a vertical cylinder, calculate the mean direct radiation flux Sb incident per unit body area, when the solar elevation angle is 15\u00b0 and the direct irradiance at normal incidence Sp is 745 Wm-2. [3 marks]\na) A caterpillar of radius 0.5 cm and length 3.5 cm is suspended in air. If the caterpillar is maintained at, Ts = 40 \u00b0C and the air temperature remains constant at T = 25\u00b0C, calculate:\na) The resistance to radiative heat transfer [1 mark] b) The power radiated by the sphere\n"}]}
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