Railway tracks made of 1025 Steel are to be laid at a time of year whenthe temperature averages 4 °C. If a joint space of 5.4 mm is allowedbetween the standard 11.9 m length, what is the hottest temperature thatcan be tolerated without the introduction of thermal stresses? Take thecoefficient of linear expansivity of the steel as 12 x 10-6 K-1.
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Railway tracks made of 1025 Steel are to be laid at a time of year when
the temperature averages 4 °C. If a joint space of 5.4 mm is allowed
between the standard 11.9 m length, what is the hottest temperature that
can be tolerated without the introduction of thermal stresses? Take the
coefficient of linear expansivity of the steel as 12 x 10-6 K-1
.
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- A 300 g glass thermometer initially at 35 ◦Cis put into 164 cm3of hot water at 94 ◦C.Find the final temperature of the thermometer, assuming no heat flows to thesurroundings. The specific heat of glass is0.2 cal/g · ◦ C and of water 1 cal/g ·◦ CA metallic girder(support) is 50 ft long andhas an initial temperatureof 30 Fahrenheit , then itwas heated to 75Fahrenheit;how much force (lb) isinvolved with theelongation of the girder ifits cross sectional area is4.0 ft^2Y metal girder = 3.0 x10^7lb/in^2Coefficient of expansion ofmetal girder= 1.0 x 10^-5/FahrenheitSuppose the ends of the rail are rigidlyclamped at −5◦C to prevent expansion.Calculate the thermal stress in the rail ifits temperature is raised to 38 ◦C. Young’smodulus for steel is 20 × 1010 N/m2.
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- (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 m? and their inside surface is at 20.0°C, while their outside surface is at 5.00°C. 1560 X W (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.) 1 kW room heaters (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 m? and their inside surface is at 20.0°C, while their outside surface is at 5.00°C. 1565.21 X W (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.) 12 1 kW room heaters now from O…Students on a spring break picnic bring a cooler that contains5.1 kg of ice at 0.0 °C. The cooler has walls that are 3.8 cm thickand are made of Styrofoam, which has a thermal conductivity of0.030 W>1m # C°2. The surface area of the cooler is 1.5 m2, and itrests in the shade where the air temperature is 21 °C. (a) Find therate at which heat flows into the cooler. (b) How much time doesit take for the ice in the cooler to melt?A hot-air balloon is inflated by heating air at constant pressure. Assume the number of air moleculesinside the balloon remains constant and that it expands at atmospheric pressure. (a) If the initial temperature and volume of theair inside the balloon are 18 °C and 1600 m3, respectively, what isthe final volume of the balloon when its temperature is increasedto 65 °C?
- A square pane of glass 0.500 m on a side is 6.00 mm thick. Whenthe temperatures on the two sides of the glass are 25.0°C and -10.0°C,the heat current due to conduction through the glass is 1.10 * 10^3 W.(a) What is the thermal conductivity of the glass? (b) If the thickness of theglass is increased to 9.00 mm, what will be the heat current?(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. 1340000 X W (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.) 2 1 kW room heaters --..-- (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. 1565.21 X W (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.) 1 kW room heaters…Under steady state conditions, a piece of wood 350 mm by 350 mm and 15 mm thick conducts heat through its thickness and loses no appreciable heat through its well-insulated sides. The rate of heat flow is measured to be 14.0 W when the temperature difference across its thickness is 28 C°. Determine the thermal conductivity of this wood.