Chemistry, 25.09.2019 01:00 blessingjessica
Human thermoregulation (modified from example 1.7 of textbook) humans are able to control their heat production rate and heat loss rate to maintain a nearly constant core temperature of t, = 310 k under a wide range of environmental conditions. this process is called thermoregulation. from the perspective of calculating heat transfer between a human body and its surroundings, we focus on a layer of skin and fat, with its outer surface exposed to the environment and its inner surface at a temperature slightly less than the core temperature, t, = 308 k. consider a person with a skin/fat layer of thickness l = 3 mm and effective thermal conductivity k = 0.3 w/mk. the person has a surface area a =1.8 m² and is dressed in a bathing suit. the emissivity of the skin is € = 0.95. 1. when the person is in still air in the middle of a summer day at t = 303 k, what is the skin surface temperature? convection heat transfer to the air is characterized by a free convection coefficient of hfree = 2 w/m²k. 2. given the hot summer temperatures, the person starts using a fan and notices that her skin surface temperature drops by 1 k. what is the new convection coefficient, hun, imposed by the fan? 3. at what temperature would the environment need to be for the person to experience the same skin surface temperature as in question 2 without the fan (i. e., only free convection)?
Answers: 1
Chemistry, 22.06.2019 10:00, emfranco1
Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?
Answers: 2
Chemistry, 22.06.2019 18:30, tanviknawale
Which sample at stp has the same number of atoms as 18 liters of ne at stp
Answers: 1
Human thermoregulation (modified from example 1.7 of textbook) humans are able to control their heat...
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