Consider fluid flow in a tube whose surface temperature remains constant. What is the appropriate temperature difference for use in Newton’s law of cooling with an average heat transfer coefficient?

Q: A Centigrade and a Fahrenheit mercury thermometer are of identical size. At what temperature will…

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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: Consider laminar forced convection in a circular tube. Will the heat flux be higher near the inlet…

A: In general, the heat transfer coefficient and wall shear stresses are higher at the region where the…

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: If you leave a metal spoon propped up in a pot Is this Conduction, convection, or radiation

A: Conduction is transfer of heat energy through one medium to another through contact.

Q: Find the net rate of heat transfer by radiation from a skier standing in the shade, given the…

A: Given:  Emmissivity, e = 0.2  temperature of body, T = 10 degree C = 283 K  temperature of…

Q: For a specified fluid pair, inlet temperatures, and mass flow rates, what kind of heat exchanger…

A: Given: Hot and cold side fluids are same for all heat exchanger. Inlet temperatures are constant.…

Q: Show that the temperature -40°C is unique in that it has the same numerical value on the Celsius and…

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Q: At what temperature do the Fahrenheit and Kelvin scales have the same numerical value?

A: The conversion of Kelvin to Fahrenheit be defined as follows: Where, K be defined as the…

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

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Q: Water at an average temperature of 23C flows through a 10-cm diameter pipe that is 2.5m long. The…

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Q: In terms of thermal expansion, why is it important that a key and its lock be made of the same or…

A: Given: Key and lock

Q: Can a medium involve (a) conduction and convection,(b) conduction and radiation, or (c) convection…

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Q: By how much does the volume of gas at 0°C contract for each decrease in temperature of 1 Celsius…

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Q: What makes heat transfer by radiation different from conduction and convection?

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Q: Why is heat transfer a nonequilibrium phenomenon?

A: Heat transfer from one medium to another occur only when there is difference in temperature.Without…

Q: At what temperature does water boil at the top of the Mount Everest?

A: The upper fixed point of water on the Celsius temperature scale is termed as boiling point. The…

Q: The primary method of heat transfer for liquid/gas (and plasma) is

A: the primary method of heat transfer for liquid/gas is convection.

Q: if we assume gas doesnot condense to liquid, what volume is approached for a gas at 0 degree celsius…

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Q: After you measure the dimensions of a plot of land with a steel tape on a hot day, you return and…

A: The metal expands and contracts according to the temperature it subjected to. The metal expands if…

Q: Calculate and plot the increase of cumulative kinematic heat (cooling) during the night of 16 hours,…

A: The given values are,

Q: Consider two equal-size rooms connected by an open door. One room is maintained at a higher…

A: Since rooms are identical they have same volume and since the doors are open they have same…

Q: The air stream flows through a steel pipe of 38.1 mm inner diameter at a velocity of 6.71 m / s and…

A: SOlution: Given that d = 38.1 mm v = 6.71 m/s

Q: Show that the coefficient of volume expansion, β, is related to the coefficient of linear expansion,…

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Q: Air (cp = 1005 J/kg·K) enters a cross-flow heat exchanger at 20°C at a rate of 3 kg/s, where it is…

A: Given data The specific heat of air of a cross-flow heat exchanger is cp = 1005 J/kgK The inlet…

Q: how could i calculate a change in temprature of a rain drop only given the velocity at which it…

A: This problem is basically based on the conservation of energy.Given the velocity, v at which it…

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: 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: What is the rate of heat loss through windows on a chilly-5 degree Celsius day from a typical house…

A: Area of windows (A) = 26 m2Thickness (d) = 4 mm inside temperature (T) = 20oC Outside temperature…

Q: How is the thermal entry length defined for flow in a tube? In what region is the flow in a tube…

A: When fluid enters a circular tube due to temperature difference between the fluid and the surface…

Q: Consider an insulated pipe exposed to the atmosphere. Will the critical radius of insulation be…

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

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Q: A long steel I-beam used in bridge construction has a length of 20.0 m. The beam may be exposed to…

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Q: Why does rubbing alcohol evaporate much more rapidly than water at STP (standard temperature and…

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Q: will the coefficient of linear expansion also increase if the metal rod is heated to a temperature…

A: As the temperature of a material increases, it begins to expand. For instance, a metal rod or beam…

Q: Consider a window glass consisting of two 4-mmthick glass sheets pressed tightly against each other.…

A: The rate at which heat transfer occurs when there is a variation in temperature is termed as 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: Forced air flows over a heat exchanger in a room heater, with a convective heat transfer…

A: As per Newton's law of cooling , Fluid at TF→ →→

Q: Room temperature is 30 degree C . Express this in degree fahrenheit and Kelvin.

A: Given:Temperature = 30o C

Q: The first real length standard, adopted more than 200 years ago, was a platinum bar with two very…

A: Given, The change in the length, ∆l=±1 μm=1×10-6 m Initial length, l0=1 m Coefficient of linear…

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: Show that the thickness of the ice on a lake increases with the square root of the time in cold…

A: Scenario: Water is at some constant temperature, air is also at some constant temperature. At any…