The temperature distribution across a wall 0.2 m thick at a certain instant of time is , where is in degrees celsius and is in meters, 200°c, -180°c/m, and 30°c/m2. the wall has a thermal conductivity of 1 w/m·k. (a) on a unit surface area basis, determine the rate of heat transfer into and out of the wall and the rate of change of energy stored by the wall. (b) if the cold surface is exposed to a fluid at 100°c, what is the convection coefficient?

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

b. a lightning bug, plug of grass, and a worm