(c) The heat capacity, C of a system is defined as the ratio of heat energy, Q transferred to or from the system and the resulting change in temperature, T: C = Determine the dimension of C.
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- The cross section radius of a bar of metal of length L and uniform coefficient of thermal conductivity k is expressed as r = (1 + x)1/2, where x is the distance from one end of the bar. Calculate the rate of heat transfer H if the two ends are kept at temperatures TH and TL respectivelyThe tidal lung volume of human breathing, representing the amount of air inhaled and exhaled in a normal breath, is 500 cm3. (Assume atmospheric pressure.) (a) What is the number of molecules of air inhaled with each human breath when the air temperature is 27.0°C?A steel beam being used in the construction of a skyscraper has a length of 36.000 m when delivered on a cold day at a temperature of 16.000°F. What is the length of the beam when it is being installed later on a warm day when the temperature is 94.000°F? (Give your answer to at least five significant figures.) (m)
- Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful. (a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.2 deg C compared with that at 33 deg C, such as on a person's skin? % Increase = 19.8 % (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 33.9 deg C compared with that at 19.8 deg C, such as for warm and cool automobile hoods? % Increase = 33.9 % ! No, that's not the correct answer.The amount of heat needed to change the temperature of an object can be calculated using thefollowing equation:Q = m c p Δ T whereQ = amount of heat in caloriesm = mass of object in gramsc p = specific heat of objectΔ T = change in temperature in ∘ C What is the appropriate unit for c p if the preceding equation is to be homogeneous in units?The upthrust exerted on a steel ball which is immersed in paraffin of temperature 20 °C is 0.2145 N, and 0.200 N when the temperature of the paraffin is 100 °C:. Based on this measurement, find the volumetric thermal expansion cocfficient of paraffin if the coefficient of linear thermal expansion of steel is 1.2.10-5 1/°C.
- When the coefficient of linear expansion, a, and the temperature change, T-T, are large, a length L, of a solid substance expands in length to a(T, -T₂) L₁ = L₁e O L=L[1 + a(Tƒ– T;)]. ○ Ly=al (Ty-T). O L=L[1 + In(a(T₁-T))]. a(T, I₂ = ₁₂₁[ 1 + ª²(²₁-7)].In a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate isolated containers. The specific heat of the substances are related by cx 2cy. If the substances receive the same amount of heat, what will be the relationship between the change in temperature, ATx and ATy? Ο ΔΤΧ ΔΙΥ O ATX Ο ΔΤ - 2ΔΤ, ATX O 2ATX ATY Ο ΔΤΧ- 4ΔΤΥ O ATX 4ATYIn a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate isolated containers. The specific heat of the substances are related by cx = 2cy. If the substances receive the same amount of heat, what will be the relationship between the change in temperature, ATx and ATy? Ο ΔΤ2ΔΤΥ Ο ΔΤ ΔΤΥ 2ATX ATY ATx = 4ATY
- (a) Calculate the rate of heat conduction (in W) through house walls that are 11.5 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 150 m2 and their inside surface is at 20.0°C, while their outside surface is at 5.00°C. Answer _________ W (NO scientific notation ONLY Real Number) (b) How many 1 kW room heaters would be needed to balance the heat transfer due to conduction? (Round your answer to the next whole integer.) Answer__________ 1 kW room heaters (NO scientific notation ONLY Real Number)An electronics device generates 33.4 W of heat energy during normal operation. The heat is dissipated from the top surface of the device to ambient air at 21°C. If the top surface area is 0.176 m2 and the convection heat transfer coefficient is 7.019 W/m2· K, what will be the surface temperature (in °C) of the device [round your final answer to one decimal place]?The medicinal thermometer commonly used in homes can be read ;0.1°F, whereas those in the doctor’s of- fi ce may be accurate to ;0.1°C. In degrees Celsius, express the percent error expected from each of these thermometers in measuring a person’s body tempera- ture of 38.9°C.