why is wood a bad conductor of heat

why is wood a bad conductor of heat

conduction The transfer of heat energy through a material - without the material itself moving. Metals are good conductors of heat but non-metals and gases are usually poor conductors of heat. Poor conductors of heat are called insulators. Heat energy is conducted from the hot end of an object to the cold end. The electrons in piece of metal can leave their atoms and move about in the metal as free electrons. The parts of the metal atoms left behind are now charged metal ions. The ions are packed closely together and they vibrate continually. The hotter the metal, the more kinetic energy The energy that moving objects have. these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons. These move through the structure of the

 why is net force a vector sum

why is net force a vector sum

The summative result of two or more vectors can be determined by a process of vector addition. The most common method of adding vectors is the graphical method of head-to-tail addition. This method involves the selection of a scale (e. g. , 1 cm = 5 km), and the subsequent drawing of each vector to scale in the specific direction. The tail of each consecutive vector begins at the head of the most recent vector. The resultant vector (the summative result of the addition of the given vectors) is then drawn from the tail of the first vector to the head of the last vector. The magnitude and direction of the resultant is then determined using a protractor, ruler, and the indicated scale. The question often arises as to the importance of the order in which the vectors are added. For instance,

 why do we need checks and balances

why do we need checks and balances

Checks and balances operate throughout the U. S. government, as each branch exercises certain powers that can be checked by the powers given to the other two branches. The president (head of the executive branch) serves as commander in chief of the military forces, but Congress (legislative branch) appropriates funds for the military and votes to declare war. In addition, the Senate must ratify any peace treaties. Congress has the power of the purse, as it controls the money used to fund any executive actions. The president nominates federal officials, but the Senate confirms those nominations. Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other. Both the House of Representatives and the Senate have to pass a bill in the same

 why do newborn puppies cry so much

why do newborn puppies cry so much

As has been said, puppies only cry for two reasons, the main one being they are hungry. And if they become chilled, they won t suckle, so = hungry. The heat around the whelping box should be AT LEAST 80F, regardless of whether mum is there or not. We had a 4 X 4 ft whelping box for early days, with a brood lamp over the top. If I felt it was making mum pant too much, I d drape a sheet across the back end, so she could get out from immediately under the lamp, but the puppies were still being kept warm. Puppies this young cannot regulate their own heat. Are they huddling together? If so, that s classic for them being cold. If they tend to crawl away and lie by themselves, they may actually be too hot. I had a thermometer on the base of the box, to keep an eye on the temperature down there.

 why do we need order of operations

why do we need order of operations

Which is it? P Both answers can't be right or we'd always be arguing about the answers to math problems. P The nice thing about math is that there's always just ONE answer! So, a long time ago, math geeks decided to make a set of rules for what to do first in a math problem. These rules are called "the order of operations. " I'll tell you what the rules are in the next lessons. P For now, remember this word:! P And go all the way through to find out what all the letters of stand for! It seems as though the answer depends on which way you look at the problem. But we can't have this kind of flexibility in mathematics; math won't work if you can't be sure of the answer, or if the exact same expression can be calculated so that you can arrive at two or more different answers. To eliminate

 why is the spanish flu called the spanish flu

why is the spanish flu called the spanish flu

Sometimes a virus contains both avian adapted genes and human adapted genes. Both the and pandemic strains contained avian flu virus segments. "While the pandemic human influenza viruses of 1957 (H2N2) and 1968 (H3N2) clearly arose through reassortment between human and avian viruses, the influenza virus causing the ' ' in 1918 appears to be entirely derived from an avian source (Belshe 2005). " (from, an excellent free on-line Book called Influenza Report 2006 which is a medical textbook that provides a comprehensive overview of epidemic and pandemic influenza. ) Barry JM (January 2004). J Transl Med. 2 (1): 3. :. P. Origins of the 1918 Pandemic: The Case for France Connor, Steve, The Guardian (UK), Saturday, 8 January 2000 Brown, David (October 10, 2005). Washington Post. ; Kolata,

 why do my veins stick out so much

why do my veins stick out so much

Bulging veins in the hands are common signs of aging; but a variety of other conditions could be the cause, some of them potentially harmful. However, in many cases, particularly those having to do with teenagers, the cause is something more benign, such as excessive activity. Due to the potential risk involved, consult a doctor to rule out a more-serious disorder. Veins are responsible for taking deoxygenated blood back to the heart and lungs to be reoxygenated. Unlike arteries, veins have valves in them that control the flow of blood. When veins bulge -- on the hand or anywhere else in the body -- it is because the blood is pooling in the vein, either due to a problem with the vein itself or an underlying condition. ...

 why do you want to become a tutor

why do you want to become a tutor

When you become a tutor, you take an active part in a studentвs life. You get to encourage and where they are the sole focus. Having only one student at a time makes it easy to give them your undivided attention. And because itвs one-on-one, you provide them with a safe learning environment. Thereвs no competition with other students or the pressure of being surrounded by oneвs peers. If you still need convincing that tutoring is the job for you, peruse this list of top 10 reasons to. Youвll become more knowledgeable about the subjects you tutor in. Tutoring gives you a glimpse into teaching and professions that involve helping others. Tutoring improves your interpersonal and communication skills. Acting as a tutor is a simple yet effective way of contributing to your community. working,

 why do you sweat when you eat spicy food

why do you sweat when you eat spicy food

The moment you eat something pungent and spicy, those little beads of sweat pop up on your forehead. The heat you re feeling comes from capsaicin found in the hot peppers. Spicy foods are pungent because of peppers. Peppers are packed with a compound known as capsaicin. Capsaicin, the chief spicy chemical present in peppers makes the body respond as if it is in a hot environment. Capsaicin sets off certain chemical receptors to cause a reflexive cooling reaction and consequently triggers sweating. What Causes Sweating When You Eat Spicy Food? Capsaicin, the most important spicy component in peppers is a molecule which is responsible for the spicy taste. The body also has a capsaicin receptor found on certain nerves that are heat-sensitive. When these nerves get activated, they send off

 why do we learn history in school

why do we learn history in school

And another one, which also makes sense. Even though, people seems to always forget history. Learning in school is important, not only for the facts being taught, but also for the learning skills. History allows us to not make mistakes again. It allows us to make good decisions concerning today's society by comparing it to societies or times in the past when a similar situation arose. For example, it teaches us how war should never be the first choice and it teaches us the importance of disarmament. The learning of history also allows students to understand their culture and the reasons for certain festivals or habits more deeply, and thus be more rooted and knowledgeable concerning their own culture. History also helps explain the diplomatic relations between countries. For example,