A: Eskimos make double wall houses of ice blocks.
R: The air trapped between double walls prevents the conduction of heat energy from inside the house to outside it.

Eskimos build double walled houses of the blocks of ice because

in thermos flask, the bacuum between the two walls prevents heat from the inside to the outside by radiation.

Why do Eskimos make double walled houses?

Mr. X was advised by an architect to make outer walls of his house with hollow bricks . The correct reason is that such walls (a) make the building stronger (b) Help keeping inside cooler in summer and warmer in winter (c ) Prevent seepage of moisture from outside (d) Protect the building from lightning

A particle of mass m is trapped between two perfectly rigid parallel walls. The particle bounces back and forth between the walls without losing any energy. From a wave point of view, the particle trapped between the walls is like a standing wave in a stretched string between the walls. Distance between the two walls is L. (a) Calculate the energy difference between third energy state and the ground state (lowest energy state) of the particle. (b) Calculate the ground state energy if the mass of the particle is m = 1 mg and separation between the walls is L = 1 cm .

The Eskimo makes his house i.e. Igloo from ice. What is the reason for this?

An ordinary refrigerator is thermally equivalent to a box of corkboard 90 mm thick and 5.6 m^2 in inner surface area. When the door is closed, the inside wall is kept, on the average, 22.2^@C below the temperature of the outside wall. If the motor of the refrigerator runs 15% of the time while the door is closed, at what rate must heat be taken from the interior whicle the motor is running? The thermal conductivity of corkboard is k=0.05 W//mK .

An ordinary refrigerator is thermally equivalent to a box of corkboard 90 mm thick and 5.6 m^2 in inner surface area. When the door is closed, the inside wall is kept, on the average, 22.2^@C below the temperature of the outside wall. If the motor of the refrigerator runs 15% of the time while the door is closed, at what rate must heat be taken from the interior whicle the motor is running? The thermal conductivity of corkboard is k=0.05 W//mK .

Two houses stand just on the opposite sides of a road of a village. A ladder that stands against the wall of the first house is at a distance of 6 metres from the house and makes an angle of 30^(@) with the horizontal line.But if the ladder stands against the wall of the second house keeping its foot at the same point, it makes an angle of 60^(@) with the horizontal line. (a) Find the length of the ladder. (b) Calculate the distance of the foot of the ladder from the foot of the wall of the second house. (c) Find the width of the road. Find the height where the top of the ladder is fixed against the wall of the second house.