A slab consists of two parallel layers of two different-materials of the same thickness, having thermal conductivities `K_1 and K_2`. What is the equivalent thermal conductivity of the slab?

Two liquids of equal mass and different densities p_1 and p_2 are mixed, what is the density of the mixture?

What is meant by the co -efficient of thermal conductivity of a material?state its unit and dimension.

The K.E of two different masses are equal.Which of the masses,lighter or heavier will have greater momentum?

Two bodies having masses 1g and 4g are moving with equal K.E find the ratio of their linear momentum.

Find the time in which a layer of ice 3 cm thick on the surface of a pond will increase in thickness by 1 mm when the temperature of the surrounding is -20°C .the thermal conductivity of ice is 2.1 W/m K, latent heatof ice 3.36 10^5J/kg and density is 900 kg/m^-3 .

A stationary particle explodes into two particle of masses m1 and m2 and move in opposite directions with velocities v1 and v2.The ratio of their K.E is

A ‘thermacole’ icebox is a cheap and efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm. if 4.0 kg of ice is put in the box, estimate the amount of-ice remaining after 6 h. The outside temperature is 45 ^@C , and co-efficient of thermal conductivity of thermacole is 0.01 J s^-1.m-^1 K-^1 . [Heat of fusion of water = 335 x 103 J kg^-1