A furnace wall consists of 25 cm firebrick, 30 cm insulating brick and 25 cm building brick , respectively. The inside wall is a temperature of 800C and the atmospheric temperature is 15 degrees * C C. Calculate the heat loss per of wall area and the temperatures of the interfaces of the furnace. The heat transfer coefficient for the outside surface is 10 W/m^ ^ 2.k and the thermal conductivities of the firebrick , insulating brick, and building brick are 6, 0.3 and 0.8W / m respectively. m^ ^ 2; tc=^ * 1 point t 1 =800^ C; t a iota c; t 2 =15^ o; 86.363 degrees * C 73.148°C 74.059 degrees * C; 68.983 degrees * C

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."