In this problem you will consider the balance of thermal energy radiated and absorbed by a person. assume that the person is wearing only a skimpy bathing suit of negligible area. as a rough approximation, the area of a human body may be considered to be that of the sides of a cylinder of length l=2.0m and circumference c=0.8m. for the stefan-boltzmann constant use σ=5.67×10−8w/m2/k4.part aif the surface temperature of the skin is taken to be tbody=30∘c, how much thermal power prb does the body described in the introduction radiate? take the emissivity to be e=0.6.express the power radiated into the room by the body numerically, rounded to the nearest 10 w. part bthe basal metabolism of a human adult is the total rate of energy production when a person is not performing significant physical activity. it has a value around 125 w, most of which is lost by heat conduction to the surrounding air and especially to the exhaled air that was warmed while inside the lungs. given this energy production rate, it would seem impossible for a human body to radiate 460 w as you calculated in the previous part. which of the following alternatives seems to best explain this conundrum? a. the human body is quite reflective in the infrared part of the spectrum (where it radiates) so e is in fact less than 0.1.b. the surrounding room is near the temperature of the body and radiates nearly the same power into the body. part cnow calculate pbr, the thermal power absorbed by the person from the thermal radiation field in the room, which is assumed to be at troom=20∘c. if you do not understand the role played by the emissivities of room and person, be sure to open the hint on that topic. express the thermal power numerically, giving your answer to the nearest 10 w. part dfind pnet, the net power radiated by the person when in a room with temperature troom=20∘c. express the net radiated power numerically, to the nearest 10 w.

Plz dont type in wrong or just say something to get all my ponit if you do thing willl happen > : l in an environment can destroy entire ecosystems. these changes can occur quickly or over time. which environmental change occurs fastest? volcanic eruption regrowth of forest after volcanic eruption pond succession decomposition of a treeover time the trees in african have increased in length. many species have had to adapt to this change in order to survive. which of the following is a structural adaptation that has the african giraffe meet this change? question 11 options: the african giraffe has become a faster at running from its predators. the african giraffe's neck has increased in size over the years. the african giraffe have moved to another part of africa. the african giraffe has not adapted and struggles to survive. eve and sammy are discussing the affects of farming on the environment. eve states that farming does not harm our environment. she believes that it is only beneficial for the ecosystem and species living in it. sammy states that farming can have major impacts on the environment. he believes farming can cause habitat loss. who is correct? question 12 options: eve is correct because farming only leads to positive affects on ecosystems. sammy is correct because farming has major affects on the environment including soil erosion and flooding. eve is correct because farming does not lead to soil erosion and flooding. neither of them are correct. a power plant recently purchased land and will be building a large factory on wetlands in florida. which of these is not an environmental effect of destroying these wetlands? question 13 options: destroying the wetlands will create a loss of habitat for many species. destroying the wetlands will create flooding. destroying the wetlands will create species to relocate to a new area. destroying the wetlands will change the climate in this area. ever since non-native mussels were introduced into the great lakes, they have caused ecological problems. mussels are very efficient filter feeders. they are better at filtering algae from the water than native species are. which of the following would not result from mussel introduction? question 14 options: excessive growth of mussel populations decline in populations of native mussel species water becoming clearer because mussels eat more algae excessive growth of algae that kills other organismswhat would be an immediate effect of the construction of roads and parking lots on the transfer of energy from producers to consumers in an ecosystem? question 15 options: a decrease in the number of producers a decrease in the number of consumers an increase in the number of producers an increase in the number of consumers

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?