Radiation from the head is a major source of heat loss from the human body. model a head as a 21-cm-diameter, 20-cm-tall cylinder with a flat top.
if the body's surface temperature is 36? c , what is the net rate of heat loss on a chilly 9? c day? all skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.
i have worked it through three times with other written solutions however i cannot arrive at the correct answer. a final answer as well as a solution would be appreciated! !

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.