What is enthalpy of a system? How is it related to the internal energy?

What is meant by power? How it is related to work?

What is energy?

What is critical angle? How is it related with refractive index?

How is impulse related with linear momentum?

How is electric field related to potential?

What is potential energy ?How is it measured?

An electric heater supplies heat to a system at a rate of 100W. If system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing

What is specific resistance of a conductor? How it is related to electrical conductivity?

How physics related with society.