58. A leaf of area 40 cm2 and mass 4.5 x 10~4kg directly

Chapter 14, Problem 58

(choose chapter or problem)

58. A leaf of area 40 cm2 and mass 4.5 x 10~4kg directly faces the Sun on a clear day. The leaf has an emissivity of 0.85 and a specific heat of 0.80 keal/kg-K. (a) Estimate the rate of rise of the leafs temperature. (b) Calculate the temperature the leaf would reach if it lost all its heat by radiation to the surroundings at 20C (c) In what other ways can the heat be dissipated by the leaf?

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