The average thermal conductivity of the walls, roof and windows of a house is 0.480 W/mºC and the average thickness is 21 cm. The total surface area of the house is 492 m2. The house is kept warm by burning natural gas having a heat of combustion of 54 x 106 J/kg. How many kilograms of natural gas needs to be burned in one day if a temperature of 22 ºC is to be maintained inside a house if the outside temperature is 1 ºC?

Q: Thermal energy is being transferred through a 0.8 mm layer of human skin at a rate of 1.1 x 104…

A: Heat is just energy in transit. When it is not moving it is thermal energy. It is that heat flows…

Q: A copper rod is 0.705 m long with a rectangular cross section of dimensions 0.0555 m by 0.0755 m.…

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Q: T T T3- Indoors ke Outdoors -L, Lム→--L- The energy transfer per second is the same in each layer.…

A: The thermal resistance of the wall is given by R=ρlA (same like electric resistence )         where…

Q: A closed box is filled with dry ice at temperature of - 78.5°C, while the outside temperature is…

A: The rate of heat flow is given by  H = K A (T'- T) td where, K is the coefficient of thermal…

Q: The core temperature of an athlete is 37 °C and his surface area is 1.8 m2. The thermal conductivity…

A: Concept: The Formula to determine the rate of Heat Flow is, Qt=kA∆Txwhere,k=Coefficient of Thermal…

Q: A copper rod is 0.803 m long with a rectangular cross section of dimensions 0.0539 m by 0.0807 m.…

A: Given Data: The length of a copper rod is, L=0.803 m The cross-sectional dimension of a rod is,…

Q: Homes are often insulated with fiberglass insulation in their walls and ceiling. The thermal…

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Q: A 720 cm X 1520 cm house is built on a 16.4 cm thick concrete slab of thermal conductivity 0.62…

A:

Q: A 755-g sample of water is heated from 5.50°C to 98.40 °C. Calculate the amount of heat absorbed (in…

A: The amount of heat absorbed by the water can be determined as, Here, m, cw, Ti and Tf   represent…

Q: A concrete slab is 10.0 cm thick and has an area of 4.50 m². Electric heating coils are installed…

A: Given data: Thickness of the slab, L=10 cm=10×10-2 m=0.1 m Area of the slab, A=4.50 m2 Temperature…

Q: Five kg of fish (Cp = 3600 J/ kgK) are packed in foam packaging with a heat transfer surface A =…

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Q: The area of the skin of an adult human being is about 2.10m^2. If the temperature of the skin of an…

A:

Q: An aluminum bar has a cross-section that is 2.5 cm by 4.8 cm and is 1.3 m long. Aluminum has a…

A:

Q: Consider a person standing in a room at 20°C with an exposed surface area of 1.7 m2. The deep body…

A: Solution:-         Room temperature T∞=20°C          Surface area As=1.7 m2…

Q: A gasoline tank in a car has a capacity of 60 L at 20ºC. If the tank is fully filled without a…

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Q: A pot of water is boiling under one atmosphere of pressure. Assume that heat enters the pot only…

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Q: A pot 25 cm in diameter is placed on the stove. The pot is made of stainless plate (k = 15 W / [m °…

A: Given data: Diameter, d=25 cm=0.25 m Conductivity, k=15 W/m0C Thickness, ∆x=0.6 cm=0.006 m Inside…

Q: A 700 cm X 1360 cm house is built on a 13.2 cm thick concrete slab of thermal conductivity 0.62…

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Q: 700 cm X 1360 cm house is built on a 13.2 cm thick

A:

Q: When excessive heat is produced within the body, it must be transferred to the skin and dispersed if…

A:

Q: Water is placed into an iron container along with an ice cube. They are thermally isolated. The…

A: mass of iron container = 620 g Initial temperature of container = 70o C mass of water (m) = 200 g…

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

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Q: Suppose the PPOSE side the temperature is 20.0 °C. the window? Give your answer oules of heat…

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Q: A 640 cm X 1160 cm house is built on a 15.2 cm thick concrete slab of thermal conductivity 0.7…

A:

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A:

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A:

Q: In a cold country, the temperature on the surface of a lake has dropped to a temperature T1 = -10°C…

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Q: In an electrically heated home, the temperature of the ground in contact with a concrete basement…

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Q: A box with a total surface area of 1.20 m and a wall thickness of 4.00 cm is made of an insulating…

A:

Q: The area of the skin of an adult human being is about 2.10m^2. If the temperature of the skin of an…

A: Solution: Given that A = 2.1 m2 T0 = 26 C T=36

Q: While swimming, conduction can play a big role in heat loss from the body. The body of one swimmer…

A: Given data: Thickness thickness (b) = 1.6 mm Thermal conductivity of the skin (k)=0.37 W/m.K Water…

Q: A rectangular window in a home has a length of 1.5 m and a height of 0.80 m. If the window allows…

A: Given Data: Length of window L=1.5 m Height of window h=0.80 m Heat is escaping at a rate of Qe=2000…

Q: An aluminum bar has a cross-section that is 5.1 cm by 6.93 cm and is 1.91 m long. Aluminum has a…

A:

Q: An aluminum bar has a cross-section that is 5.07 cm by 6.38 cm and is 1.53 m long. Aluminum has a…

A: Given, crossection of the aluminium bar, 5.07 cm ×6.38 cmlength of the aluminium bar, L = 1.53…

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.