A day during which the atmospheric temperature was 40oC would be described as (a) below freezing. (b) a nice day. (c) a hot day. (d) above boiling.
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- A high-end gas stove usually has at least one burner rated at 14 000 Btu/h. (a) If you place a 0.25-kg aluminum pot containing 2.0 liters of water at 20.C on this burner, how long will it take to bring the water to a boil, assuming all the heat from the burner goes into the pot? (b) Once boiling begins how much time is required to boil all the water out of the pot?What are the following temperatures on the Kelvin scale? (a) 68.0 F, an indoor temperature sometimes recommended for energy conservation in winter (b) 134 F, one of the highest atmospheric temperatures ever recorded on Earth (Death Valley, California, 1913) (c) 9890 F, the temperature of the surface of the SunA 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.
- 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 =In a particular area, a 1⁄3-ton cooling unit (4,000 Btu/hr [British thermal unitsper hour]) will comfortably cool an 18,600-cu ft house. A homeowner has a1⁄3-ton unit for her 16,000-cu ft home. She would like to add a family room tothe house. She would like it to be 20 feet by 15 feet by 8 feet. Can she buildthis addition without enlarging her cooling unit?In winters, it is often warmer in San Francisco than in nearby Sacramento, 150 km inland. In summers, it is nearly always hotter in Sacramento. Explain how the bodies of water surrounding San Francisco moderate its extreme temperatures.
- On a cold day (by Orlando standards), you turn on the TV to hear the meteorologist say that the temperature outside is 28.8 degrees Fahrenheit. What is this in degrees Kelvin?(3 ).Regarding heat capacity, latent heat and temperature: (a ).The difference between specific heat capacity and heat capacity relates to the mass of substance involved. (b ).Heat is a form of kinetic energy which can be transferred from a colder substance to a hotter substance. (c ).Temperature is the property of a substance that determines whether an object will receive heat or give heat to another object. (d ).An example of latent heat of fusion is the heat associated with a solid dissolving into a liquid at a constant temperature. (e ).A clinical example of latent heat is in the use of ethyl chloride spray for topical anaesthesia.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
- On a cold winter day when the temperature is -20.0 ∘C, what is the amount of heat needed to warm to internal body temperature (37.0 ∘C) the 0.550 L of air exchanged with each breath? Assume that the specific heat capacity of air is 1020 J/(kg⋅K) and that 1.0 L of air has a mass of 1.3 g. Express answer in joules.At night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward; the much cooler sky above radiates much less. Patches of ground under trees can stay warmer, which is why, if you livesomewhere that has cold, clear nights, you may have noticed some mornings when there is frost on open patches of ground but not under trees. Why does being under a tree keep the ground warmer?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.
