Hot air is to be cooled as it is forced to flow through the tubes exposed to atmospheric air. Fins are to be added in order to enhance heat transfer. Would you recommend attaching the fins inside or outside the tubes? Why? When would you recommend attaching fins both inside and outside the tubes?

Q: Why does the bottom of a tire pump feel hot when you pump air in the tire, but when air is released,…

A: Given:  A pump which is used to pump air into a tire.

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: A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed…

A:

Q: Which two factors affect the amount of thermal energy an object has?

A: Thermal energy is total energy caused by motion

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: Which two factors affect the amount of thermal energy an object has?

A: Two factors that affect the amount of thermal of an object are  1) The average kinetic energy of the…

Q: Why does the pressure of gas enclosed in a rigid container increase as the temperature increases?

A: Increase in temperature means increase in the kinetic energy of the particles. And increase in…

Q: The  silica cylinder  of a radiant wall heater is 60cm long and has a radius of 5mm. If it is rated…

A: Given: Length h = 60 cm or 0.6 m radius r = 5 mm or 0.005 m P = 1.5 kW or 1500 W Stefan's constant =…

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

A: Walk on the wet sand

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: If you hold one end of a metal bar against a piece of ice, the end in your hand will soon become…

A: Conduction : The process in which heat flows from objects with higher temperature to objects with…

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

A: Metal can is cooler

Q: On a very cold sunny day, you wear a black coat and a transparent plastic coat. Which coat should be…

A:

Q: When is heat transfer through a fluid conduction and when is it convection? For what case is the…

A:

Q: The drawing shows a solid cylindrical rod made from a center cylinder of lead and an outer…

A:

Q: The objects made up of steel, mica, wood and brass are lying in the same room during winter season.…

A:

Q: Consider two finned surfaces that are identical except that the fins on the first surface are formed…

A: Given: Consider two finned surfaces that are identicalexcept that the fins on the first surface are…

Q: The partial vacuum that exists between the two glass panels of a thermal window does not minimize…

A:

Q: Someone comments that a microwave oven can be viewed as a conventional oven with zero convection…

A: A microwave oven can be viewed as a conventional oven with zero convection resistance at the surface…

Q: After filling your gas tank to the top and parking your car in direct hot sunlight, why does the…

A: The molecules are free and widely spreading an expanded gas. So, its density is less as compared to…

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: 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: Two walls are made of the same type of concrete and have the same temperature difference between…

A: No. of walls = 2  type of concrete = same  temp. differnce is same in both inside and outside of…

Q: Why does the balloon in a smaller container filled with hot water sink after it has been put in a…

A: Given: Why does the balloon in a smaller container filled with hot water sink after it has been put…

Q: Your neighbor has circular steel lid for his well. The lid has an outer diameter of 0.909 m. The…

A: The expansion in area with temperature is given by ∆A=Aiα∆TWhere α is linear expansion, ∆T is change…

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: A circular pipe of OD 20 cm is enclosed centrally in a square section insulation of 36 cm side. The…

A: Given-Outer Diameter= 20cm or 0.2mSide of square section=36cm or 0.36mThermal Conductivity (K)…

Q: Why is it important that glass mirrors used in astronomical observatories be composed of glass with…

A: A telescope uses glasses for high precision measurements and observations, and a slight variation in…

Q: Suppose you are an astronaut in the vacuum of space, hard at work in your sealed spacesuit. The only…

A: In this case, the astronaut is in the vacuum space, wearing a sealed spacesuit.   There is no solid…

Q: In the Newton's Law of Cooling, at small differences of temperatures between the body and the…

A: Step1: Newton's Law of Cooling Newton’s law of cooling states that the rate of heat loss from a body…

Q: Why do fishermen sail out to the sea in the night? What process helps them to sail easily to the sea…

A: The land’s specific heat capacity is very low as compared to the sea’s specific heat capacity. This…

Q: Why are thermometers that are used in weather stations shielded from the sunshine? What does a…

A: When thermometer is exposed to sunshine, there will be an increase in the temperature reading due to…

Q: You apply a flame to 1 L of water for a certain time and its temperature rises by 2°C. If you apply…

A: Q = m C dt  Q is the heat applied  m is the mass / quantity of the material C is the specific heat…

Q: Can all three modes of heat transfer occur simultaneously (in parallel) in a medium?

A: Due to difference in temperature energy get transfer, this energy is heat energy. Transfer of heat…

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: On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he…

A: Given:  Hot summer day

Q: Why does a bottle of tire pump feel hot when you pump air in the tire, but when air is released, the…

A:

Q: When a hot object and a cold one are placed in thermal contact, the temperature at equilibrium will…

A: Recall principle of calorimetry Heat lost by hotter body=heat gained by colder body

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…