### Thermodynamics and Heat Transfer: Educational Insights #### Question 13:**Why would a floor made of silver feel colder than one made of wood if both are at the same temperature?***Answer:*A floor made of silver feels colder than one made of wood at the same temperature because silver is a much better conductor of heat than wood. This means that silver can transfer heat away from your skin more quickly than wood can. When you touch the silver floor, heat from your body is rapidly conducted away, making it feel colder. In contrast, wood, being an insulator, does not transfer heat as effectively, so it feels warmer to the touch.#### Question 14:**How does thermal underwear work to keep you warm?***Answer:*Thermal underwear works to keep you warm by providing an additional layer of insulation and reducing the loss of body heat. They are usually made of materials with good insulating properties, such as wool or synthetic fibers, which trap a layer of air close to your body. This trapped air acts as an insulator, slowing down the transfer of heat away from your body. Additionally, thermal underwear often wicks away moisture, keeping you dry and preventing the cooling effect that comes from evaporating sweat.#### Question 15:**Why are you told to "layer" if you want to stay warm in the winter?***Answer:*Layering is an effective way to stay warm in the winter because each layer traps air and provides insulation, reducing the amount of heat that escapes from your body. Multiple layers create several barriers against cold air and allow you to adjust your level of insulation based on your activity and the outside temperature. The layers typically include a base layer to wick moisture away from your skin, a middle layer for insulation, and an outer layer to protect against wind and moisture. This method of dressing helps to maintain body heat while also providing flexibility to adapt to varying conditions.

13. In general,metals feel colder or hotter than other materials at the same temperatures because…

13. Why would a floor made of silver feel colder than one made of wood if both are at the same temperature? 14. How does thermal underwear work to keep you warm? 15. Why are you told to "layer" if you want to stay warm in the winter?

13. Why would a floor made of silver feel colder than one made of wood if both are at the same temperature? 14. How does thermal underwear work to keep you warm? 15. Why are you told to "layer" if you want to stay warm in the winter?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

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3. A steel rod has a length of 3.000 cm at room temperature (20° C). A brass rod has a length of 2.997 cm at the same temperature. To what temperature must the rods be heated so that both of them will have the same length. (Coeffcients of linear expansion of steel and brass are, respectively, 11 x 10-6 K-¹ and 19 × 10-6 K-¹.)
1. Two 50g ice cubes are dropped into 200g of water in a thermally insulated container. The water is initially at 25°C, and the ice comes directly from a freeze at -15°C, what is the final temperature of the drink when the drink reached thermal equilibrium?
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2. Compare the heat loss from an insulated and an uninsulated copper pipe (k-400 W/m K) under the following conditions. The pipe has an internal diameter of 10 cm and an external diameter of 12 cm. The inside surface temperature of the pipe is at 110°C. The pipe is located in a space where all possible outside surface temperature of material was maintained at 30°C. The insulation available to reduce heat losses is 5 cm thick and its conductivity is 0.20 W/m K. If the furnace for heating the fluid in the pipe operating at an efficiency of 85% using natural gas priced at Cg = Php 1.00/MJ, what is the daily cost of heat loss per meter of pipe?