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000000001	The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation.? . Science & Mathematics Physics The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation.? It is a good approximation to assume that the emissivity e is equal to 1 for these surfaces. Find the radius of the star Rigel, the bright blue star in the constellation Orion that radiates energy at a rate of 2.7 x 10^32 W and has a surface temperature of 11,000 K. Assume that the star is spherical. Use σ =... show more Follow 3 answers Answers Relevance Rating Newest Oldest Best Answer: Stefan-Boltzmann law states that the energy flux by radiation is proportional to the forth power of the temperature: q = ε · σ · T^4 The total energy flux at a spherical surface of Radius R is Q = q·π·R² = ε·σ·T^4·π·R² Hence the radius is R = √ ( Q / (ε·σ·T^4·π) ) = √ ( 2.7x10+32 W / (1 · 5.67x10-8W/m²K^4 · (1100K)^4 · π) )
000000002	The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation.? . = 3.22x10+13 m Source (s):http://en.wikipedia.org/wiki/Stefan_bolt...schmiso · 1 decade ago0 18 Comment Schmiso, you forgot a 4 in your answer. Your link even says it: L = 4pi (R^2)sigma (T^4). Using L, luminosity, as the energy in this problem, you can find the radius R by doing sqrt (L/ (4pisigma (T^4)). Hope this helps everyone. Caroline · 4 years ago4 1 Comment (Stefan-Boltzmann law) L = 4pi*R^2*sigma*T^4 Solving for R we get: => R = (1/ (2T^2)) * sqrt (L/ (pi*sigma)) Plugging in your values you should get: => R = (1/ (2 (11,000K)^2)) *sqrt ( (2.7*10^32W)/ (pi * (5.67*10^-8 W/m^2K^4))) R = 1.609 * 10^11 m? · 3 years ago0 1 Comment Maybe you would like to learn more about one of these?
000000003	The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation.? . Want to build a free website? Interested in dating sites? Need a Home Security Safe? How to order contacts online?
000000004	Developmental Milestones and Your 8-Year-Old Child . "School-Age Kids Growth & Development Developmental Milestones and Your 8-Year-Old Child8-Year-Olds Are Expanding Their Worlds By Katherine Lee | Reviewed by Joel Forman, MDUpdated February 10, 2018Share Pin Email Print Eight-year-olds are becoming more confident about themselves and who they are. At age 8, your child will likely have developed some interests and hobbies and will know what he or she likes or doesn't like. At the same time, children this age are learning more about the world at large and are also better able to navigate social relationships with others more independently, with less guidance from parents. At home, 8-year-olds are able to tackle more complicated household chores and take on more responsibility for taking care of themselves, even helping out with younger siblings. In general, according to the CDC, these are some changes you may see in your child: Shows more independence from parents and family.
000000005	Developmental Milestones and Your 8-Year-Old Child . Starts to think about the future. Understands more about his or her place in the world. Pays more attention to friendships and teamwork. Wants to be liked and accepted by friends.1 Behavior and Daily Routines Fabrice Le Rouge/Getty Images The 8-year-old's behavior and daily routines are shaped by the child's taste, interests, and personality. Parents and other significant adults in the child's life should keep in mind the importance of being good role models since this is a time when children are figuring out the world and who they are and how they fit into it. At this age, your child may get involved with more complex social activities and behaviors that help define his or her sense of self. Effective discipline techniques at this age include continuing to praise good behavior, focusing your child's efforts, what they can do and change, rather than innate traits (such as ""you are smart"").
000000006	Developmental Milestones and Your 8-Year-Old Child . Set up and enforce consistent rules. Discipline should be aimed at guiding your child rather than punishing. Follow it with a discussion with your child about what she could do differently next time. Your 8-year-old can do more self-care in regards to hygiene and may begin to want to be part of deciding what the family eats. You might begin to give your child chores to contribute to the maintenance of the household and an allowance to begin to learn to manage money. At this age, your child still needs 10 to 11 hours of sleep per night.2 Physical Development Image Source/Getty Images For 8-year-old children, physical development will continue to be more about refinement of skills, coordination, and muscle control rather than huge changes. They begin to look like ""big kids,"" but puberty is still a couple of years away for most of them.
000000007	Developmental Milestones and Your 8-Year-Old Child . Children with natural athletic potential may show their abilities at this developmental stage as their physical skills become more precise and accurate. In fact, this is often the age at which children decide whether they are athletic or not, and choose to participate in or avoid sports. Either way, it's important for parents to encourage physical activity. Even if your child isn't an athlete she can still enjoy running, swimming, biking, and many other types of non-sports-related physical fun.3 Emotional Development John Howard/Getty Images Eight-year-old emotional development may be growing at a deeper level than in younger years, and an 8-year-old may show more sophisticated and complex emotions and interactions. For instance, an 8-year-old may mask true thoughts or emotions to spare someone else's feelings or work through a problem without an adult's close supervision or intervention.
000000008	Developmental Milestones and Your 8-Year-Old Child . This is the time when your child may be developing a more sophisticated sense of himself in the world. Her interests, talents, friends, and relationship with family all help her to establish a clear self-identity. It's also the beginning of desiring privacy and flip-flopping between self-confidence and self-doubt. It can be a good time to help your child develop patience and empathy for others.4 Cognitive Development Tom Merton/Getty Images Eight-year-old children are at a stage of intellectual development where they will be able to pay attention for longer periods of time. You can expect your child to be able to concentrate on an activity for up to an hour or more. Eight-year-olds will also be able to think more critically and express opinions using more complex and sophisticated vocabulary and language skills.5 Social Development Christopher Futcher/Getty Images This is the phase of social development where many children love being a part of sports teams and other social groups.