Why do two layers of a cloth of equal thickness provide .. warmer covering than a single layer of cloth of double the thickness?

Explain why two layer of cloths of equal thickness provide warmer covering than a single layer of double thickness.

Woolen clothes are warmer than cotton cloths why?

The breaking force for a wire is F. What will be the breaking forces for.: (/) two parallel wires of this size and (ii) for a single wire of double thickness?

The breaking force of a wire is F . What will be the breaking force for (i) Two parallel wires of same size and (ii)for a single wire of double thickness ?

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?

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 .