The wall of a furnace is made up of inside layer of silica brick 120 mm thick covered with a layer of magnetite brick 240 mm thick. the temperature at the inside of the silica brick wall and the outside surface of magnetite brick wall are 7250c and 1100c respectively. the contact thermal resistance between the two walls at the interface is 0.00350c/w per unit wall area. if the thermal conductivities of the silica and magnetite bricks are 1.7 w/m0c and 5.8 w/m0c, calculate: a. the rate of heat loss per unit area of walls, and b. the temperature drop at the surface.

the answer is a)

mark brainliest

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.

the right answer is 0.3 meters per second