Cite two reasons why firewalkers don't burn their wetted feet when walking barefoot on red hot coals?

Q: Even though metal is a good conductor, frost can be seen on parked cars in the early morning even…

A: The radiation from the Sun will be absent early in the morning. Therefore, the surrounding…

Q: Many American homes have an outdoor pool for the children. On a hot summer day, why do the children…

A: American uses outdoor pool for children. Children find relief in the pool

Q: Why is it possible to hold a lighted match stick until the flame burns quite close to the fingers?

A: The match stick is made up of wood which is the bad conductor of heat. When the lighted match stick…

Q: It is a hot summer day 50 degrees C. How much heat in calories is needed to freeze a puddle of water…

A: The heat energy is absorbed by the water molecules and begin to dissociate from one atom into…

Q: The heating effect depends on which factors?

A: The heating effect of current depends on the following factors : The amount of time for which the…

Q: What are the two types of flames produced if you manipulate the air holes in a bunsen burner?

A: The Bunsen burner produces two types of flames depending on whether the air hole is open and the…

Q: Pieces of copper and glass are heated to a same temperature . Why does the piece of iron feel hotter…

A: Copper is a very good conductor of heat. So, it allows maximum amount of heat to pass through it…

Q: Why does the temperature of boiling water remain the same as long as the heating and boiling…

A: The temperature of the boiling water will not exceed 100°C as long the heating and the boiling…

Q: WHAT ARE THE APPLICATIONS OF OXYGEN BOMB CALORIMETER

A: Answer:-    Oxygen bomb calorimeter measure the heat of chemical reaction and physical changes. The…

Q: Why is Mercury Used in Thermometers?

A: Mercury is the only metal that is in liquid state at room temperature. It is used in thermometers…

Q: Why is whitewash sometimes applied to the glass of florists’ greenhouses in the summer?

A:

Q: The sparks from a sparkler have a temperature of around 2000°C. Why do they not bun your hand when…

A: The thermal energy of  object depends on its temperature, mass and type of material.

Q: Cite three examples in which Thermos bottle inhibits heat transfer?

A: The Thermos bottles use thermal isolation to prevent the transfer of the thermal energy or heat.

Q: In lab you submerge 100 grams of 40 C nails in 100 grams of 20 C water. Equate the heat gained by…

A: Heat lost by the iron nail is equal to the heat gained by the water.

Q: Why firewalkers dont burn their wetted feet when they walk barefoot on red-hot coals

A:

Q: When fighting fires, a firefighter must use great caution to hold a hose that emits large amounts of…

A: The hose is pumping a lot of water with large mass at a high speed. This means that water has a…

Q: Since all the objects emit energy to the surroundings, why don't the temperature of all the objects…

A: An object which is a good energy emitter will be also very good absorber. Such bodies are said to be…

Q: How can devices that heat homes in winter also be used to cool homes in summer?

A: A heat pump pumps heat from the colder environment to the warmer one. During winter, the pump moves…

Q: Explain why a firewalker can step quickly without harm on red-hot coals with bare feet.

A: A firewalker can step quickly on red-hot coals with bare feet as wood is a very good insulator.

Q: Explain why a firewalk er can step quickly without harm on red hot coals with bare feet.

A:

Q: Some solar energy devices used in homes circulate air over a bed of rocks that absorb thermal energy…

A: Use principle of calorimetry and put the values to calculate energy stored.    Given:mass of…

Q: As a cook you hold place a metal pan(with a wooden handle attached to it) on top a hot flame and…

A: Given As a cook you hold place a metal pan(with a wooden handle attached to it) on top a hot flame…

Q: Why does the car in the car radiator sometimes boil explosively when the radiator cap is removed?

A: Boiling happens when a liquid molecules have enough energy to break free from surrounding molecules.…

Q: Why does the water in a car radiator sometimes boil explosively when the radiator cap is removed?

A:

Q: When I sit by a campfire, how does its hot air heat me?

A: When you sit by a campfire, most of the heat you are receiving from the fires does not come from hot…

Q: Which is more painful, burn caused by condensing steam or burn caused by boiling water at the same…

A: Given:- Which is more painful, burn caused by condensing steam or burn caused by boiling water at…

Q: If a room-temperature spoon is placed into a hot cup of coffee, followed by a teaspoon of cream from…

A: Given that a room-temperature spoon is placed into a hot cup of coffee, followed by a teaspoon of…

Q: what happens as the temperature of an object increases?

A: It is very general scenario with various effects on the body and exhibited by the body. In layman…

Q: The equation for the power emitted by the human body is P = (5.67 × 10^-8)AT^4. If the area of the…

A: power emitted P =5.67x10-8 AT4 P emitted = σεA T4 Power radiated  = σεA (T4 - T04) Power radiated…

Q: Why doesn't energy added to boiling water increase the temperature of the water?

A: When the water is boiling, it is on the course of undergoing a phase transition from its liquid…

Q: Why is steam burn more damaging than a burn from boiling water of the same temperature?

A: Latent heat of vaporization:Without changing the temperature of the liquid, the amount of energy…

Q: 0.863). It has a temperature of 67.0 °C. The new owner of the house paints the radiator a lighter…

A:

Q: What is the heat in joules required to raise the temperature of 25 grams of water from 20◦C to…

A:

Q: given 1,000,000 J of ebergy, what is the maximum amount of gold you can melt? The latent heat of…

A:

Q: How much thermal energy is (J) required to boil 2.50 kg of water. at 100˚C into steam at 139.0°C. 2…

A: Given Mass of water = 2.5 kg Initial temperature= 100 °C Final temperature = 139 °C Latent heat…

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: Why does the boiling temperature of water decrease when the water is reduced under pressure, such as…

A: A substance starts boiling when the vapor pressure of the substance overcomes the ambient pressure.

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: You apply a flame to 2 L of water for a certain time and its temperature rises by 2°C. If you apply…

A: You apply a flame to 2 L of water for a certain time and its temperature rises by 2°C. If you apply…