Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

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Answer 1

Textbook Question

Chapter 11, Problem 1CQ

Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

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Students have asked these similar questions

Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

Thermal energy is being transferred through a 0.8 mm layer of human skin at a rate of 1.1 x 104 W/m2. The room temperature is 27 °C.To reduce heat flux, the skin is wrapped with a clothing material. What should be the thickness of the clothing material covering the surface of this skin tissue to reduce the heat flux to half of its original value? What is the temperature at the skin-clothing material interface? Note: if you think you need to have more information to solve this problem, you can make assumptions. Please state them clearly in your answer, if you need to make such assumptions.And please explain step by step to the answer to better understanding

A 24.0 g copper ring at 0°C has an inner diameter of D = 2.90760 cm. A hollow aluminum sphere at 81.0°C has a diameter of d = 2.91274 cm. The sphere is placed on top of the ring (see the figure), and the two are allowed to come to thermal equilibrium, with no heat lost to the surroundings. The sphere just passes through the ring at the equilibrium temperature. What is the mass of the sphere? The linear expansion coefficient of aluminum is 23.0 x 106 /C°, the linear expansion coefficient of copper is 17.0 x 10-6 /C, the specific heat of aluminum is 900 J/kg-K, and the specific heat of copper is 386 J/kg-K. Al Gu Number i Units

Answer 2

Textbook Question

Chapter 11, Problem 1CQ

Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

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Answer 3

Textbook Question

Chapter 11, Problem 1CQ

Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

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Answer 4

Textbook Question

Chapter 11, Problem 1CQ

Rub the palm of your hand on a metal surface for 30 to 45 seconds. Place the palm of your other hand on an unrubbed portion of the surface and then on the rubbed portion. The rubbed portion will feel warmer. Now repeat this process on a wooden surface. Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than for the metal surface?

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

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Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

Answer 8

Expert Solution & Answer

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

Why does the temperature difference between the rubbed and unrubbed portions of the wood surface seem larger than the metal surface.

Answer 12

Explanation of Solution

Conducting materials are good in transferring of heat and electricity while non-conducting materials are poor in transferring of heat and electricity. Wood is a non-conducting material while metal is a conducting material.

The conductors and non-conductors are classified due to the difference in thermal conductivity. Conducting material has high thermal conductivity and non-conducting materials has very low thermal conductivity. So, heat is transferred quickly across the metals whereas it is not so with the wood. When the palm is placed on the rubbed portion of the wood surface due it very low thermal conductivity heat remained at the same place and so, wooden surface seems hotter than the metal surface.

Conclusion:

Heat is conducted quickly across the metal surface while it is not so with the wood. Hence, wooden surface seems hotter than the metal surface.

Answer 13

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