Does the phrase diretion of zero vectro have physical significance?Discuss in terms of velocity, force etc.

Does the phrase "direction of zero vector" have physical significance? Discuss in terms of velocity, force etc.

What is Gibbs free energy change? Discuss its physical significance.

Define centrepetel force and express it in terms of angular velocity

What kind of lining does trachea have ? Does it have any significance?

Does the density have any significance in the weight - less state?

Why does the mass of the nucleus not have any significance in scattering in Rutherford's experiment ?

Define the term 'drift velociy' and 'relaxation time' giving their physical significance.

Name the physical quantity, which is expressed as force times velocity.

The total energy of the hydrogen atom is negative. What significance does this have ?