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If Two Bodies Are in Thermal Equilibrium in One Frame, Will They Be in Thermal Equilibrium in All Frames? - Physics

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प्रश्न

If two bodies are in thermal equilibrium in one frame, will they be in thermal equilibrium in all frames?

संक्षेप में उत्तर

उत्तर

If two bodies are in thermal equilibrium in one frame, they will be in thermal equilibrium in all the frames. In case there is any change in temperature of one body due to change in frame, the same change will be acquired by the other body.

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Thermal Expansion
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अध्याय 1: Heat and Temperature - Short Answers [पृष्ठ ११]

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एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
अध्याय 1 Heat and Temperature
Short Answers | Q 1 | पृष्ठ ११

संबंधित प्रश्न

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z


Answer the following question.

Derive the relation between three coefficients of thermal expansion.


Answer the following question.

What is thermal stress?


Answer the following question.

Give an example of the disadvantages of thermal stress in practical use?


A metal rod of cross-sectional area 3 × 10-6 m2 is suspended vertically from one end has a length 0.4 m at 100°C. Now the rod is cooled upto 0°C, but prevented from contracting by attaching a mass 'm' at the lower end. The value of 'm' is ______.

(Y = 1011 N/m2, coefficient of linear expansion = 10-5/K, g = 10m/s2)


A metal rod of length Land cross-sectional area A is heated through T °C. What is the force required to prevent the expansion of the rod lengthwise?

(Y = Young's modulus of material of the rod, α = coefficient of linear expansion of the rod.)


The volume of a metal block changes by 0.86% when heated through 200 °C then its coefficient of cubical expansion is ______.


As the temperature is increased, the time period of a pendulum ______.


The radius of a metal sphere at room temperature T is R, and the coefficient of linear expansion of the metal is α. The sphere is heated a little by a temperature ∆T so that its new temperature is T + ∆T. The increase in the volume of the sphere is approximately ______.


A student records the initial length l, change in temperature ∆T and change in length ∆l of a rod as follows:

S.No. l(m) ∆T (C) ∆l (m)
1. 2 10 `4 xx 10^-4`
2. 1 10 `4 xx 10^-4`
3. 2 20 `2 xx 10^-4`
4. 3 10 `6 xx 10^-4`

If the first observation is correct, what can you say about observations 2, 3 and 4.


Calculate the stress developed inside a tooth cavity filled with copper when hot tea at temperature of 57°C is drunk. You can take body (tooth) temperature to be 37°C and α = 1.7 × 10–5/°C, bulk modulus for copper = 140 × 109 N/m2.


Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is 'α'. The metal sheet is heated uniformly, by a small temperature ΔT, so that its new temeprature is T + ΔT. Calculate the increase in the volume of the metal box.


A metal ball immersed in water weighs w1 at 0°C and w2 at 50°C. The coefficient of cubical expansion of metal is less than that of water. Then ______.


Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

  • Assertion A: When a rod lying freely is heated, no thermal stress is developed in it.
  • Reason R: On heating, the length of the rod increases. In light of the above statements.

choose the correct answer from the options given below:


If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be ______.


A solid metallic cube having a total surface area of 24 m2 is uniformly heated. If its temperature is increased by 10°C, calculate the increase in the volume of the cube.

(Given: α = 5.0 × 10-4°C-1)


A glass flask is filled up to a mark with 50 cc of mercury at 18°C. If the flask and contents are heated to 38°C, how much mercury will be above the mark? (α for glass is 9 × 10-6/°C and coefficient of real expansion of mercury is 180 × 10-6/°C)


A metal rod Y = 2 × 1012 dyne cm-2 of coefficient of linear expansion 1.6 × 10-5 per °C has its temperature raised by 20°C. The linear compressive stress to prevent the expansion of the rod is ______.


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