Q: Loose-fitting white clothing covering most of the body, shown below, is ideal for desert dwellers,…
A: In desert the climate during day is sunny hot while during night it is cold. The speed of the air is…
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Q: Cite three ways in which a Thermos bottle inhibits heat transfer.
A: Construction of thermos is as shown in the figure. Coffee is stored in an internal container as…
Q: In what form does the radiant energy travels?
A: Light is the form of radiant energy. Radiant energy travels through waves or particles.
Q: If the composition of the upper atmosphere were changed so that it permitted a greater amount of…
A: The earth’s atmosphere is very important to maintain the temperature of earth. It also protects us…
Q: In which form of heat transfer is a medium not required?
A: There are three ways of heat transfer. They are conduction, convection and radiation. Conduction is…
Q: On a chilly 10°C day, your friend who loves cold weather says she wishes it were twice as cold.…
A: Here, 10°C in Kelvin = 10+273 = 283 K -131.5°C in Kelvin = -131.5+273 = 141.5 K
Q: Why is evaporation a cooling process?
A: Evaporation is the process in which water changes its phase from liquid to gaseous.
Q: Why is thermal pollution a relative term?
A: Thermal pollution is the thermal energy pumped into the atmosphere, water bodies, etc. by the…
Q: Show that 5000 cal are required to increase the temperature of 50 g of water from 0°C to 100°C. The…
A: Heat Required Q = m*c*(T2 - T1 )
Q: According to the law of conservation of energy, if ocean water cools, something else should warm.…
A:
Q: When there is morning frost on the grass in an open park, why is frost unlikely to be found on the…
A: The ground beneath the bench absorbs less solar radiation compared to the open ground. The ground…
Q: How is heat capacity of a body related to specific heat capacity of its substance?
A: Heat capacity is defined as the heat required in raising the temperature of a substance by 1 degree…
Q: Cite three examples in which Thermos bottle inhibits heat transfer?
A: The Thermos bottles use thermal isolation to prevent the transfer of the thermal energy or heat.
Q: The rate of heat flow by conduction through a slab does NOT depend upon the *
A: Heat flow is given by ∆Q∆t=-kA∆T∆x
Q: Why is it important to protect water pipesin the winterso that they don't freeze?
A:
Q: Calculate the rate of heat energy emitted by 100 m2 of a polished iron surface (emissivity 50.06).…
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Q: What makes heat transfer by radiation different from conduction and convection?
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Q: Everybody knows that warm air rises. So it might seem that the air temperature should be higher at…
A: When air will get warmer, it will rises and expands. As air is expanding, the pressure will be…
Q: What is thermal stress? Give some examples?
A: Thermal stress is the stress created by a change in temperature of a material. They can lead to…
Q: What generally happens to the temperature of rising air and sinking air?
A: If the Air sinking down compresses air at the surface, raising temperatures near the ground. The…
Q: Consider a car radiator at 110.5°C in a 53.5°C environment and the exchange of heat between them by…
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Q: Consider a car radiator at 112°C in a 47.5°C environment and the exchange of heat between them by…
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Q: is the type of thermal energy transfer that causes a camp fire to warm us. O a. convection O b.…
A: Emission of energy in waves or rays refers as radiation.
Q: Why the climate of a harbour town is more temperate than that of a town in a desert at the same…
A: Reason : The climate of a harbour town is more temperate than that of a town in a desert at the same…
Q: If equal amounts of heat are added to different masses of water, their temperatures go up the same.…
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Q: The Earth cools off at night much more quickly when theweather is clear than when cloudy. Why?
A: The cooling of Earth happens predominantly by radiation.
Q: Why will clouds tend to form above either a flat or a mountainous island in the middle of the ocean?…
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Q: Compare the rate of heat conduction through a 13.0-cmthick wall that has an area of 10.0 m2 and a…
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Q: What does the high specific heat of water have to do with convection currents in the air at the…
A: Specific heat capacity is the amount of heat energy required to raise the temperature of unit amount…
Q: Discuss why water can issue from deep underwater vents at temperatures of some 300°C without…
A: In hydrothermal vents, temperature of water might be as high as 300 degrees but it does not boil.
Q: If you were caught in freezing weather with only your own body heat as a source, would you be warmer…
A: In a freezing weather, only source of heat available is body temperature.
Q: What determines whether an object is a net absorber or net emitter of radiant energy at given time?
A: All substance above absolute temperature emit radiant energy. Whether the object emits more than it…
Q: Desert sand is very hot in day and very cool at night. What does this indicate about its specific…
A: The formula of the specific heat:
Q: Does heat flow into cold areas or does cold flow into hot areas?
A: Yes heat flows from hot to cold area or we can say it moves with the help of particle or atom. for…
Q: Why is it important to protect water pipes in the winter so that they don’t freeze?
A: Given: water pipes
Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.
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- calculate the thermal recharge of an area 25.0 km by 40.0 km where the average heat flow is 270 mW per square metre.Assume that you are evaluating a building that has a heated slab-on-grade floor with edge insulation of R = 5.0 and a perimeter of 1000 ft. If your design temperature range is 5°F to -5°F, what is the heat loss, in BTU/hr, through the edge of the floor? 62,000 BTU/hr 31,000 BTU/hr 47,000 BTU/hr 23,000 BTU/hrGlider pilots in the Midwest know that thermal updrafts are likely to occur in the vicinity of freshly plowed fields. Why?
- You're considering purchasing a new sleeping bag whose manufacturer claims will keep you warm to -10°F. The bag has down insulation with 4.0-cm loft (thickness). Your body produces heat at the rate of 100 W and has area 1.5 m². Considering only conductive heat loss, will you be able to maintain normal body temperature in the bag at -10°F?Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of 300 K.Radioactive decay of granite and other rocks in Earth's interior provides sufficient energy to keep the interior molten, to heat lava, and to provide warmth to natural hot springs. This is due to the average release of about 0.03 J per kilogram each year. Find an increase in temperature for a thermally insulated chunk of granite that takes about 12.6 million years to change temperature. (Assume that the specific heat capacity cc of granite is 800 J/kg-CoJ/kg•Co. Use the equation Q=cmATQ=cmAT.)
- Example: A water tank with a wall thickness of 10 mm and a water temperature of 90 "C.) Calculate the average heat loss per square meter (unit area) if the ambient air temperature is 15 "C. Take the thermal conductivity coefficient of the wall material 50 W / m C, the water heat-convection coefficient of 2800 W/m2°Cand the heat-convection coefficient of the ambient air 11 W/m2°C. Calculate the two temperatures of the wall surfaces.Please answer all my questions A house walls that are 21 cm thick and have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The walls’ surface area is 1350000 cm2 and their inside surface is at 21°C, while their outside surface is at 6°C. (Thermal conductivity of glass wool is 0.042 W/m°C) (i) Calculate the rate of heat conduction through house walls? Answer for part 1 (ii) How many 100W room heaters would be needed to balance the heat transfer due to conduction? (approximate number) Answer for part 2 b) A spherical infrared heater of radius 5.5 cm has an emissivity of 0.73. What temperature must it run at if the required power is 0.54 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =Consider a car radiator at 115°C in a 50.5°C environment and the exchange of heat between them by radiation. Calculate the net rate of heat transfer, in watts, by radiation from the car's radiator, if it has an emissivity of 0.750 and a 1.3-m2 surface area. Q/Δt =
- Consider a car radiator at 101.5°C in a 44.5°C environment and the exchange of heat between them by radiation. (a) Calculate the net rate of heat transfer, in watts, by radiation from the car's radiator, if it has an emissivity of 0.750 and a 1.4-m2 surface area.A window of a car is found to be covered with 0.9 cm of ice. If the area of the window is 1 m2, and the ice is at -12 degrees Celsius, what is the minimum heat required to melt all the ice? Take the density of ice to be 900 kg/m3, the specific heat capacity of ice to be 0.5 cal/gK and the latent heat of fusion to be 80 cal/g.For a cube-shaped room, 10 ft on a side, what will be the rate of heat loss if the R-value is 4 ft2-°F-hr/Btu for each side and the temperature difference is 50°F? Consider heat loss through all four walls, the ceiling, and the floor. 1200 Btu/hr 800 Btu/hr 5000 Btu/hr 7500 Btu/hr 12,000 Btu/hr Submit