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

Q: How does the diameter of opening in the cast iron plate of a kitchen stove change when stove is…

A: One might think that when heated, the diameter of the opening in the cast iron decreases as the cast…

Q: Can an object be both a good absorber and a good reflector at the same time? Why, or why not?

A: A good absorber object is an object that can absorb all the radiations without reflecting while a…

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: when our bodies are hot they produce sweat, which helps to cool us down. Using this fact determine…

A: Our body skin is insulator as well as conductor depending on the situation. If outside temperature…

Q: What is  the observation and conclusion of  the experiment of demonstrating good and bad conductors…

A: Good conductor Bad conductor Materials that allow heat to pass through them easily are called good…

Q: Discuss why a 1-ft2 hole in a ceiling that admits sunlight when the Sun is overhead is like having a…

A:

Q: Why does a bimetallic strip bend with changes in temperature?

A: Bimetallic strip consists of two strips made of two different type of materials having different…

Q: Of the following objects, which would be good insulators against heat? Pick ALL correct answers A…

A: Conductor of heat :-  The object along which heat can move easily says as conductor of heat.…

Q: What is the critical radius of insulation? How is it defined for a cylindrical layer?

A: To describe Critical Radius

Q: What is affect of changing the volume on (PV)?

A: According to Boyle's law, for an ideal gas PV = constant where, P is pressure and V is the volume of…

Q: Why do woolen blankets keep us warm better than cotton sheets?

A: In the woolen blanket, there are more gaps. So, more air are confined within woolen blanket. Air is…

Q: Why does a wire not simply cut a block of ice in two when it passes through the ice?

A: As the wire passes through the ice block, there is a pressure induced beneath the wire which melts…

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: Why are such materials as wood, fur, feathers, and even snow good insulators?

A: The materials which allow the free passage of electricity through them with very low resistance are…

Q: From greatest to least, rank the frequency of radiation of these emitters of radiant energy: (a)…

A: Red-hot star Bluehot star and the Sun, they all emit electromagnetic waves with the frequency of the…

Q: How does the frequency of radiant energy relate to the absolute temperature of the radiating source?

A: The frequency of the radiant energy is directly proportional to the absolute temperature of the…

Q: The two requirements for conduction to occur are difference and physical

A: Im conduction there is a heat ene6 transfer by the molecules of the medium it self.

Q: A shirt is placed on the ironing board to be ironed. The heat is transferred from iron to the shirt…

A: There are three methods through which heat can be transferred from one object to another . These are…

Q: What two energies are involved in the interaction of radiant energy?

A:

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: Any architect will tell you that chimneys are never used as a weight-bearing part of a wall. Why?

A:

Q: Why do we wear woollen clothes in winter?

A: During winter season the human body temperature increases to the environmental temperature and heat…

Q: Why two thin blankets are warmer than a single blanket of double the thickness?

A: Step 1If there are more layers, air can’t pass deeper.

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

A:

Q: Why temperature of hand increases when we rub it against each other?

A: Reason : When you rub your hands together, the action of scraping the surface of your skin back and…

Q: What do fiberglass and snow have in common that make them good insulators?

A:

Q: The temperature of a swimming pool is maintained at 20-degree Celsius when the outside temperature…

A: The expression for the required comparison between the heat transfer energy is,

Q: What happens to the temperature of water as it is boiling?

A: BOILING: Boiling is the process by which a liquid turns into a vapor when it is heated to its…

Q: Chocolate candy in your hand will eventually melt as heat is conducted from your hand to the…

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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: Why are materials such as glass and and rubber good insulators?

A:

Q: Woolen clothes are worn in winter, Why?

A: Woollen clothes are worn in winter, because air is a poor conductor of heat.

Q: If water had a lower specific heat capacity, would ponds be more likely to freeze or less likely to…

A: A lower heat capacity means that less energy must be transferred to result in a temperature change.

Q: Thermal conductivity of air is less than that of felt, but felt is a better heat insulator in…

A: the thermal conductivity of air is less than the felt where as the open air conduct heat  through…

Q: What is Conduction in physics ?

A: Conduction is the transfer of thermal energy or electric charge through a material through direct…

Q: Microprocessor chips have a “heat sink” glued on top thatlooks like a series of fins. Why are they…

A: A heat sink transfer heat energy from microprocessor to surrounding the air. The finned shaped…

Q: In buildings that are being electrically heated, is it at all wasteful to turn all the lights on? Is…

A:

Q: What is the best material to use to insulate a home?

A: Bulk insulation includes materials such as glass wool, wool, cellulose fiber, polyester and…

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: What determines whether an object is a net absorber or net emitter of radiant energy at given time?

A: All substance above absolute temperature emit radiant energy. Whether the object emits more than it…

Q: What is role of loose electrons in heat conductors?

A:

Q: Why is there a need for a quick transfer of the hot shots into the water in the calorimeter?

A: The transfer hot shots into the water in calorimeter should be done as quick as possible.

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

A: Cold air in the atmosphere carries that heat away from the body. ... In this way, the blanket…

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

A: According to Kelvin’s statement of second law of thermodynamics, it is impossible for any object to…