Does an ordinary electric fan cool the air? Why or why not?If not, why use it?

Q: What is the relation of heat transfer with the air conditioning system?

A: According to the second low of thermodynamics heat transfer takes place from a hotter body to a…

Q: What happens to the gas pressure within a sealed gallon can when it is heated? When it is cooled?…

A: Explanation:

Q: When you blow on the back of your hand with your mouth wide open, your breath feels warm. But if you…

A: When we blow out air keeping your mouth wide open your hand feels hot because the air has the…

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: 1. When objects are in thermal equilibrium, they have the same: O Energy O Gravity O Temperature…

A: Two objects are said to be in thermal equilibrium when they have same temperature. .

Q: Can ice be colder than 0 degree C ? What is the temperature of the an ice- water mixture?

A: The temperature of ice can go down to 273 degree which is zero Kelvin or absolute zero.

Q: What can go wrong if you grasp the handle of a hot skillet with a wet thin dishcloth?

A: When we hold the handle of a hot skillet with a wet thin dishcloth, then the water molecules…

Q: if you are wearing clothes to prevent heat from escaping your body in the winter, how do you explain…

A: Wearing clothes helps in holding air in little pockets close to the body. This air gets warmed by…

Q: Why is wet sand at a beach cooler to walk on than dry sand?

A: Walk on the wet sand

Q: Why does water in a metal canteen stay cooler if the clothjacket surrounding the canteen is kept…

A: Metal can is cooler

Q: Consider a sphere and a cylinder of equal volume made of copper. Both the sphere and the cylinder…

A: Given:  sphere and cylinder

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: Which is the smaller temperature increment - a degree Celsius or a degree Fahrenheit? Explain.

A: You see that Celsius has 100 degrees between the freezing and boiling point, whereas Fahrenheit has…

Q: ‘An object contains more heat’- is it a right statement? If not why?

A: Heat: Heat is energy transferred to or from a thermodynamic system by methods other than…

Q: Does it ever make sense to say that one object is "twice as hot" as another? Does it matter whether…

A: In Celsius scale zero point energy can be chosen arbitrarily but in Kelvin scale absolute zero…

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

A: Given:  air conditioning unit

Q: What happens if the calorimeter is not covered properly?

A: Calorimeter or bomb calorimeter is defined as a apparatus used for measuring the amount of heat…

Q: 89. The temperatures indoors and outdoors are 299 and 312 K, respectively. A Carnot air conditioner…

A: Given: The indoor temperature is T1=299 K. The outdoor temperature is T2=312 K. The outdoor heat is…

Q: Suppose you stand with one foot on ceramic flooring and one on a wool carpet, making contact over an…

A:

Q: Is there more than one method of heat transfer? If so, then how are they similar and different than…

A: Heat is the transfer of energy from one medium to another. The heat can be transferred by:…

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

A: Given:  an electric fan

Q: You are asked to test a machine that the inventor calls an“in-room air conditioner”: a big box,…

A: The Law of Conservation of Energy. In order to cool the air coming out of the machine, some other…

Q: An astronaut has two objects that are identical in all respects, except that one is painted black…

A: Which of the two objects painted black and silver cools down at a faster rate.

Q: The zero kelvin is called absolute zero, why?

A: the zero kelvin temperaature or -273.15 degree celcius is known as absolute zero since the all the…

Q: When would you use the Latent Heat formula instead of the Specific Heat Capacity formula?

A: Heat is also a form of energy. When heat is added, temperature increase is likely to occur.

Q: On a cold windy day, a window will feel colder than on an equally cold day with no wind. This is…

A: Concept: The temperature of two systems is the same when the systems are in thermal equilibrium,…

Q: Someone claims that the air space in a double-pane window enhances the heat transfer from a house…

A: We would disagree with this recommendation since the air space introduces some thermal resistance to…

Q: On a cold day, Why does a metal door knob feel colder than wooden door?

A: Metal is a very good conductor of heat energy than wood. So, it conducts heat away from our hand…

Q: Metal lids on glass jars can often be loosened by running hot water over them. Why does that work?

A: Metal lid on glass jar is generally made up of steel or aluminum.

Q: Farmers resort to spraying fruit trees with water before a frost to protect the fruit from freezing.…

A:

Q: The heat never flows spontaneously from a colder object to a hotter object. why?

A: Heat flows

Q: A 7.0 Kg of glass bowl (clas= 840 J/Kg C°) contains 16.0 Kg of punch at 25.0°C. 2.5 Kg of ice (Ciee=…

A: Given: cglass=840 J/kg·°C, cice=2.0×103 J/kg·°Ccwater=4184 J/kg·°C, mglass=7 kgmp=16 kg, mice=2.5 kg…

Q: If placed in outer space where there is a near vacuum, a heated object will lose almost all of its…

A:

Q: A newspaper article about the weather states that “the temperature of an object measures how much…

A: Temperature is the measure of the the average kinetic energy of the molecules in a system and it is…

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: Your car’s radiator is made of steel and is filled with coolant. You fill the radiator to the very…

A: Coefficient of volume expansion of the standard coolant of the vehicle is βcoolant=410×10-6 /°C and…

Q: Why must an object be weighed at room temperature?

A: To explain :  Why must an object be always weighed at room temperature

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.