In buildings that are being electrically heated, is it at all wasteful to turn all the lights on? Is turning all the lights on wasteful if the building is being cooled by air- conditioning?

Q: If you want to preserve the hotness of the coffee, while waiting for your date, should you add the…

A: If you want to preserve the hotness of the coffee, you should add the cream now or later by the…

Q: Woollen clothes are poor conductor of heat but they keeps us warm. Give reason

A: Woolen clothes are thin and there is no much air gap between the fabric. The air pockets lying in…

Q: Why will water flow more readily than cold water through small leaks in a car radiator?

A: Surface tension of liquid depends on temperature. As temperature increases, surface tension…

Q: A co-worker of mine was once installing sheet-styrofoam insulation in the walls of his new garage.…

A: We know the relation connecting the voltage, work done and charge. Which is given by;…

Q: How is the energy in gasoline converted andreleased when it burns in an automobile engine?

A: Law of energy conservation: Energy neither can be created nor be destroyed.It can  be converted only…

Q: Consider a pan of water being heated (a) by placing it on an electric range and (b) by placing a…

A: In an electric range, there is a chance of heat loss. But in the later case the loss of heat is very…

Q: When can you add heat to something without raising its temperature?

A: When water is heated, the temperature rises till 100oC and then it boils. After this point, the…

Q: If you leave a fan running, it actually warms up the air in the room, a fact that surprises many…

A: room becomes warm

Q: You need to pick up a very hot cooking pot in your kitchen. You have a pair of hot pads. Should you…

A: As air is bad conductor of heat, but water can conduct heat via convection.

Q: Does a substance that cools off quickly have a high or low specific heat capacity?

A:

Q: Defend the statement that 100% of the electrical energy that goes into lighting a lamp is converted…

A: The statement that 100% of the electrical energy that goes into lighting a lamp is converted to…

Q: At what common temperature would a block of wood and a block of metal feel equally cold or equally…

A: for any object feel equal cold or equal hot when it is touched since the temperature of any object…

Q: Is it the boiling of water or the higher temperature of water that cooks food faster in a pressure…

A: Food can be cooked more quickly in a pressure cooker.

Q: How does the second law of thermodynamics relate to the direction of heat flow?

A: Let us understand this with an example. A hot cup of coffee is kept in open atmosphere.

Q: If a cool cup of water is floated inside of a pot of water that is already boiling, will the water…

A: If  cup is conductor of heat the water can boil when its temperature reaches to 100 degree celsius.…

Q: Suppose that you cut a small gap in a metal ring. If you were to heat the ring, would the gap become…

A: This question is from the Thermal Expansion section of Thermodynamics, As we know Thermal Expansion…

Q: State and explain Joule's Law of Heating?

A: Joule’s law is a mathematical expression of the rate at which resistance in a circuit turns electric…

Q: A co-worker of mine was once installing sheet-styrofoam insulation in the walls of his new garage.…

A:

Q: If the refrigerator door is left open, what happens to the temperature of the kitchen?

A: Entropy in thermodynamics is defined as the degree of randomness or disorder in a system. The…

Q: How much heat is lost through a 3’× 5' single-pane window with a storm that is exposed to a 60°F…

A: Heat lost Q is the product of U-value, temperature difference ∆T and area A. Therefore,

Q: Is metal a good heat shield?

A: heat shield means the protection form heat

Q: ......... is the flow of energy from warmer matter to cooler matter. Is it heat or conduction?

A: Conduction is a process of heat transfer in the solids. When two solid objects at different…

Q: Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one…

A: Given:Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just…

Q: An electric fan not only doesn’t decrease the temperature of air, but it actually increases air…

A: Given:  an electric fan

Q: A submerged heater is used to keep an aquarium above room temperature. Where should the heater be…

A: Hot water has low density while cold water has high density .

Q: Why is insulation in an attic commonly thicker than the insulation in the walls of a house?

A: It is a basic law of physics that heat rises. Therefore, more heat can be lost at the ceiling or…

Q: Hot sand cools off faster at night than plants and vegetation. Then, the specific heat capacity of…

A: Given Hot sand cools off faster at night than plants and vegetation. We have choose the correct…

Q: You are cold, so you cover yourself in a blanket. A half hour later, you feel much warmer. Explain…

A:

Q: Explain why high quality thermos bottles have a vacuum lining as a major component of their…

A: The transfer of the heat from any substance takes place in three ways, 1. Conduction, 2. Convection…

Q: Make a contrast between a boot that is chilly and a boot that is warm.

A: We have to find the difference between a chill boot and a warm boot.

Q: you are trying to keep your house warm in the winter. using the idea of conduction, convection, and…

A: Conduction is the transfer of energy from more energetic particles of a substance to adjacent less…

Q: Why is heating more efficient in large apartment buildings than in single-family dwellings?

A: The surface to volume ratio is inversely proportional to the dimension of the building. Hence, a…

Q: A piece of wood lying in the Sun absorbs more heat than a piece of shiny metal. Yet the metal feels…

A: A piece of wood lying in the Sun absorbs more heat than a piece of shiny metal.

Q: What will happen if a metal piece is touched with a finger in arctic cold?

A: A metal piece in artic cold will be frozen. When skin is exposed to cold weather conditions or came…

Q: How are you quickly able to bring a pan of water to a boil when water is poor conductor of heat?

A: The conductivity of water is less than that of most metals but greater than that of air. Even though…

Q: An iron nail becomes hot when it is hammered, Why?

A: Whenever there is an increase in temperature of an object, it is due to the increase in the object’s…

Q: Does a common electric fan cool the air in the room? If not then why it is used an overly warm room?

A: A fan doesn’t cool the room but it only recirculates the air in the room and the air inside is…

Q: An object radiating energy at night is in contact with the relatively warm Earth. How does its…

A:

Q: When you blow up a balloon, do you slightly warm the balloon? When air is allowed to rush out of it,…

A: Let us assume the gas to be ideal and the ideal gas equation reads, All the symbols have their…

Q: Which law of thermodynamics tackles the role of insulators and conductors in heat flow: zeroth,…

A: