In my text it was said that ΔH=ΔU+ΔnRT
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...
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 case.is it friction then how?