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  1. akshay86

    Thermodynamic equation from textbook

    In my text it was said that ΔH=ΔU+ΔnRT H:ENTHALPY U:INTERNAL ENERGY Δn:n of gaseous products-gaseous reactents they use ΔnRT instead of Δ(PV),here T is constant⇒U is a constant(U is a function of temperature) then why didn't the term ΔU became zero? what is the actual equation?is it is...
  2. akshay86

    Rolling motion

    if a central force acts on a sphere it will rotate and move and also a angular momentum is given to that body it will also move in the same manner.What provide torque in first case and net force in second it friction then how?