A rectangular brass plate of sides 15 cm and 8cm and thickness 0.8cm has it's opposite faces maintained at 373 K and 343 K respectively. How much heat will flow through the plate per minute? K for brass = 109.2 W/mK.

Total area of glass - planes of the window in a room is 10 m^2 and thickness is 2mm .Temperature outside and inside of the room are respectively 5^@ C and 20^@C . What is the amount of heat in calories flowing out of windows of the room per minute ? K for glass - 0.84 in mks system

A metal rod 25 cm long and 10sq cm in cross section has it's one end placed in boiling water and the other end in melting ice. Calculate the mass of ice method per minute if K for metal is 378 W/mk. Latent heat of fusion of ice - 80 K cal/gm . J = 4200 j/Kcal.

Two spheres of radii 1cm and 2 cm have been charged with 1.5 xx 10^-8C and 0.3 xx 10^-7C respectively. If they are connected with a wire will there be any charge flow? Explain.

An insulating wall consists of 4cm of material of thermal conductivity K_1 and a second layer of 8 cm thickness whose conductivity K_2 = 4K_1 . The innermost and outermost surfaces are kept at -10^@ C and 76^@ C respectively. Calculate the temperature at the interface.

Metal slab is made up of two parallel side plates of metal A and metal B of thickness 0.6 cm and 0.4 cm respectively. Their respective thermal conductivities are 2.268 and 1.008 SI unit. The outer surface of the plate A is at 220^@ and that of plate B at 20^@ . Find the temperature of the interface .

How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 8.0 h at a current of 8.46 A ? What is the area of the tray if the thickness of the silver plating is 0.00254 cm? Density of silver is 10.5 g// cm^(3) .

A steel rod is 3.000 cm in diameter at 25^@C . A brass ring has an interior diameter of 2.992 cm at 25^@C . At what common temperature will the ring just slide onto the rod ? (Coefficient of linear expansion of steel= 12 xx 10^(-6) per k and coefficient of linear expansion of brass= 18 xx 10^(-6) per k) .

Twenty per cent of the surface sites of a catalyst is occupied by nitrogen molecules. The density of surface sites is 6.023 xx 10^(14) g cm^(-3) . The total surface area is 1000 cm^2 . The catalyst is heated to 300 K and nitrogen is completely adsorbed into a pressure of 0.001 atm and volume of 2.46 cmo. Calculate the number of sites occupied by nitrogen molecules.