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conceptual questions
  • 1)The length of a brass rod is found to be smaller on a hot summer day than on a cold winter day as measured by the same aluminium scale.does it mean that brass rod shrinks on heating?


    2)Can work be done by a system without changing its volume?


    3)A mass m hits a rough floor with a velocity v at an angle of incidence theta with normal.if coeff of friction if s& coeff. of restitution is e ,find angle of reflection.

    4)how do we decide direction of friction in case of rolling?explain with help of example.
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  • for question no.1: its jsut that the coefficient of expansion of heat for alumunium would be greater than that of brass which is responsible for the phenomenon mentioned.
  • for Q1: further which means that event though on heating the brass rod expands , but when compared to alumunium its expansion is less which is y it seems to be smaller on a hot summer day when measured with an alumunium scale than on a cold day.
  • [quote="rajatahuja92@yahoo.com"]1)The length of a brass rod is found to be smaller on a hot summer day than on a cold winter day as measured by the same aluminium scale.does it mean that brass rod shrinks on heating?


    2)Can work be done by a system without changing its volume?


    3)A mass m hits a rough floor with a velocity v at an angle of incidence theta with normal.if coeff of friction if s& coeff. of restitution is e ,find angle of reflection.

    4)how do we decide direction of friction in case of rolling?explain with help of example.


    Ques 1) If two bodies are in thermal equilibrium in one frame, will they be in thermal equilibrium in all frames ? Ques 2) Does the temperature of a body depends on the frame from which it is observed ? Ques 5) Is it possible for two bodies to be in thermal equilibrium , if they are not in contact ? A5 is 'yes', unless you have a strange definition of 'contact'- two bodies may exchange energy by radiation. A1 and A2 are, I think, 'no' and 'yes'. http://en.wikipedia.org/wiki/Unruh_effect

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