Rate Of Heat Flow

When the temperature difference between inside and outside of a room is 20^(@)C ,the rate of heat flow through a window is 273 Js^(-1) . If the temperature difference becomes 20K, the rate of flow of heat through the same window will be:

The two ends of a metal rod are maintained at temperature 100^(@)C and 110^(@)C . The rate of heat flow in the rod is found to be 4.0 J//s . If the ends are maintained at temperature s 200^(@)C and 210^(@)C . The rate of heat flow will be

The two ends of a metal rod are maintained at temperatures 100^(@)C and 110^(@)C . The rate of heat flow in the rod is found to be 4.0 j//s . If the ends are maintaind at temperatures 200^(@)C and 210^(@)C , the rate of heat flow will be :

The ends of metal road are maintained at temperature 120°C and 150°C . The rate of heat flow in the road is to be found to be 10 J/s . If an identical rod is connected in parallel with this rod and ends temperature are maintained at 220°C and 250°C , then net rate of flow of heat will be

The three rods shown in figure have identica dimensions. Heat flows from the hot end at a rain of 40 W in the arrangement (a). Find the rates of heat flow when the rods are joined as in arrangement (b). (Assume k_(AJ) = 200 W/m ‘^(@)C and K_(Cu) = 400 Wim ‘^(@)C )

A uniform metal ring with centre C have two points A and B such that angle ACB is theta . A and B are maintained at two different constant temperature. If the angle between A and B i.e. theta=180^(@) the rate of heat flow from A and B is 1.2W , then what will be the rate, when theta=90^(@) ?