The body maintains a stable conditon even when the outside envisonment changes. How?

An electric heater is used in a room of total wall area 137m^(2) to maintain a temperature of 20^(@)C inside it, when the outside temperature is -10^(@)C .The walls have three different layers of materials. The innermost layer is of wood of thickness 2.5cm, the middle layer is of cement of thickness 1.0cm and the outermost layer is of brick of thickness 25.0cm. Find the power of the electric heater. Assume that there is no heat loss through the floor and the celling. The thermal conductivities of wood, cement and brick are 0.125Wm^(-1)C^(-1) , 1.5Wm^(-1)C^(-1) . and 1.0Wm^(-1)C^(-1) respectively.

Identify the correct statements from the below. 1) Fresh water vertebrates maintain higher salt concentrations in their body fluids. (II) Marine vertebrates maintain lower salt concentrations in their (III) Terrestrial animals have more water in their body than the surrounding. (IV) Osmoconformers are not able to change their internal osmotic concentration.

Same retarding force is applied to stop the train in certain distance. When the speed is doubled, how is this distance changed?

When a glass rod is rubbed with a silk cloth, changes appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charger.

The figure below represents the variation of current with potential for a metal. a. Identify the situation. c. Even when the potential is zero, there is current. Explain. d. Current is zero for a particular potential. How does this potential help in determining the velocity of electrons?

Balu went to kuttraalam with his grandpa, when he saw the waterfalls falling down from the top of a mountain he could not believe his eyes. He loved admiring it. He adked grandpa how this is possible. Grandpa said even now the answer to this question from where the water is coming from the top of a mountain is a puzzle, but we got some scientific truths behind this flow. (ii) Give the formula for time of flight of the waterfall.