Suppose that, at a restaurant, you are served coffee before you are ready to drink it. In order that it be hottest when you are ready for it, should you add cream to the coffee right away or wait until you are ready to drink it?

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: If you vigorously shake a can of chicken broth back and forth for more than a minute, will the…

A: Yes increases.

Q: The patient's fever, it turns out, is being caused by the patient's own body generating too much…

A: Given The patient will produce 1683 joules of excess heat each minutefor 12 full hours before the…

Q: Fused quartz possesses an exceptionally low coefficient of linear expansion, 5.50 × 10-7 (°C)-!.…

A:

Q: In cooling a drink, does it make any difference whether 10 g of water at 0oC is added or 10 g of…

A: There are three different states of matter : solid(ice) , liquid(water), gas(steam) The energy…

Q: What mode of heat exchange is involved in “wind chill,” when moving air feels colder than still air…

A: The mode of heat exchange involved in "wind chill " is heat loss through…

Q: Explain why burns caused by steam at 100°C on the skinare often more severe than burns caused by…

A: Given information: It is given that the burns caused by steam at 100 oC on the skin are more severe…

Q: How can you cause heat to flow from a body at lower temperature to one at higher temperature?

A: Heat can flow from a body at high temperature to a body at low temperature by any one or combination…

Q: Explain why on a cold day the metal door handle of an automobile feels colder to touch than a…

A: The thermal conductivity of a metal is greater than that of plastic. The difference is in the order…

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

A:

Q: On a very hot day, it’s possible to cook an egg on the hood of a car. Would you select a black car…

A: Body or surface having black color have more absorbing capacity of radiation and will reflect very…

Q: The Earth is not in thermal equilibrium with sun, Why?

A: The temperature of the sun and that of earth aren’t the same. Sun is at a very high temperature and…

Q: Air-conditioning units contain no water whatever, yet it is common to see water dripping from them…

A: Given:  air conditioning unit

Q: Explain why a cup of water (or soda) with ice cubes stays at 0oC, even on a hot summer day.

A: Thermal equilibrium: If the temperature of the system remains constant, the system is said to be in…

Q: Explain why a cup of water (or soda) with ice cubes stays at 0ºC , even on a hot summer day.

A: The ice and the liquid water (or soda) will be in thermal equilibrium. Therefore, the temperature of…

Q: As a result of a temperature rise of 28 C°, a bar with a crack at its center buckles upward (see the…

A: We need to first know the increase/decrease in length of a bar due to a temperature increase. The…

Q: Why do we feel hot after a long period of running or doing exercise?

A: When we do running or any exercise, it will lead to increase in the muscular activity.

Q: Two rods each having a length of 20 cm and a radius of 5 cm are coonected as shown. How much heat is…

A:

Q: Old-time kitchen lore suggests that things cook better (evenly and without burning) in heavy…

A: heavy cast-iron pots

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: Why will wrapping a bottle in a wet cloth for an outing often produce a cooler bottle than placing…

A: Wrapping a bottle in a wet cloth for an outing often produces a cooler bottle than placing the…

Q: Indigenous peoples sometimes cooked in watertight baskets by placing enough hot rocks into the water…

A:

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: When you step out of a swimming pool on a hot , dry day in the southwest , you feel quite chilly.…

A: When heat flows from our body, we feel chilly.

Q: Assume the total heat of vaporization (per gram) of water can be used to supply the energy needed to…

A: The latent heat of vaporization of water is 540 cal / gm

Q: Cite two reasons why firewalkers don't burn their wetted feet when walking barefoot on red hot…

A: The conductivity of red hot coal is very low. They conduct heat at a very slow rate. When the…

Q: An old method for breaking boulders was to put them in a hot fire and then to douse them with cold…

A: This is because of sudden thermal expansion and contraction

Q: In times past, on a cold winter night, it was common to bring a hot object to bed with you. Which…

A: For iron Specific heat is 0.46 kJ/kgK and for water specific heat is 4.186 kJ/kgK Since mass and…

Q: The heat supplied to a substance during its change of state, does not cause any rise in temperature?…

A: The heat energy supplied to the substance during its change of state does not occur any rise in…

Q: Why does a piece of watermelon stay cool for a longer time than sandwiches do when both are removed…

A: Given:  watermelon and sandwiches

Q: Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it…

A: Heat released from rock can be expressed as

Q: Does it necessarily mean that, when an object feels colder than another, the object has a lower…

A: The temperature is the degree of hotness or the coldness of a body.

Q: Does wood have a low conductivity if it is very hot—that is, in the stage of smoldering, red-hot…

A: The conductivity of wood is very low at every temperature; even in the stage of red-hot coals. We…

Q: the simplest method of purifying water, although you do need a source of heat to do it, and it takes…

A: Boiling:-  It is the simplest method to purify water, in this method, we heat up the water up to its…

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 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: Suppose a 60-kg person consumes 2,500 Cal of food in one day. If the entire heat equivalent of this…

A:

Q: When you stand on ice with skates, the blades on the bottom have a low surface area, and so they…

A: The phase diagram for H2O has a negative fusion curve. In other words, the change in pressure is…

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…