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- Discuss how
heat is transferred in our atmosphere by: (a)conduction ,(b)convection ,(c)radiation
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- For the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)Suppose a person is covered head to foot by wool clothing with average thickness of 2.00 cm and is transferring energy by conduction through the clothing at the rate of 50.0 W. What is the temperature difference across the clothing, given the surface area is 1.40 m2?The rate of heat flow through a slab does not depend on whichof the following? (a) The temperature difference between opposite faces of the slab. (b) The thermal conductivity of the slab. (c)The thickness of the slab. (d) The cross-sectional area of the slab.(e) all
- Can a medium involve (a) conduction and convection,(b) conduction and radiation, or (c) convection and radiationsimultaneously? Give examples for the “yes” answers.Radiation is emitted(a) only by glowing objects such as the Sun.(b) only by objects whose temperature is greater than thetemperature of the surroundings.(c) only by objects with more caloric than their surroundings.(d) by any object not at 0 K.(e) only by objects that have a large specific heat.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 =
- The rate of heat flow through a slab does not depend on whichof the following? (a) The temperature difference between opposite faces of the slab. (b) The thermal conductivity of the slab. (c)The thickness of the slab. (d) The cross-sectional area of the slab.(e) The specific heat of the slabWhy do fishermen sail out to the sea in the night? What process helps them to sail easily to the sea in the night and come back to the shore in the morning? think about processes like conduction, convection and radiationDiscuss the following: (a) Heat (b) Temperature (c) Thermal Equilibrium (d) Thermal Expansion. Minimum of 3 sentences per letter. The longer explanation per letter the better.
- A pond in winter has a layer of ice 5cm thick. The temperature of the air above the ice is -10C and the temperature of the water directly below the ice is 0C. (i) Find out how much heat passes by conduction through a square meter of ice each second (thermal conductivity of ice = k_ice = 2.2 W/m C) (ii) How would the amount of heat transfer differ if the ice were 7.5 cm thick instead of 5 cm thick? (how many times as much or as less)The average temperature of the atmosphere has increased by 0.4°C over the last thirty years. Estimate how much energy has gone into warming up the planet in this way. Keep in mind that the atmosphere has a mass of 5 × 1018kg, and the specific heat capacity of air is about 1 Jg−1K−1.You are in space, compare the rate of heat loss for bare skin vs. a nice thick layer of polychloroprene (space suit material). How thick should your space suit be to be comfortable? specific heat of human body is 3500 J/kg K, specific heat of polychloroprene 2200 J/kg K, temperature in space 2.6 K.
