Using the result of part (a) in 58, take into account
Chapter 21, Problem 59GP(choose chapter or problem)
Problem 59GP
Using the result of part (a) in Problem 58, take into account radiation from the leaf to calculate how much water must be transpired (evaporated) by the leaf per hour to maintain a temperature of 35°C.
Problem 58
A leaf of area 40 cm2 and mass 4.5 × 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 kcal/kg·K. (a) Estimate the rate of rise of the leaf’s temperature. (b) Calculate the temperature the leaf would reach if it lost all its heat by radiation to the surroundings at 20°C. (c) In what other ways can the heat be dissipated by the leaf?
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