An in compere ssible fluid si flowing through a pipe. If at point A the radius be 2r and velocity be V,then what will be the velocity at B where the radius is r?

An incompressible fluid flows steadily through a cylindrical pipe which has radius 2R at point A and radius R at point B. Further, along the flow direction, if the velocity at point A is v, its velocity at point B will be

If the radius of the first Bohr orbit is r, what would be the radius of the second ?

Water is flowing in streamline motion through a horizontal tube. The pressure at a point in the tube is p where the velocity of flow is v. At another point, where the pressure is p/2, the velocity of flow is [density of water =rho ]

A particle of mass m is revolving along a circular path of radius r with uniform angular velocity omega . What will be the magnitude and direction of the angular momentum of that particle ?

If a planet of mass m revolves round sun of mass M_0 in the.circular path of radius r, then what will Be the velocity of resolution of that planet?

Charge of an electron is e and mass m. The electron is moving around a nucleus of charge Ze in a cirular path of radius r. What will be the velocity of the electron ?

When a current of 1 A flows through a copper wire of cross sectional area 1mm^2 the drift velocity of free electrons becomes v, What will be the drift velocity of free electrons when the same current flows through a copper wire of cross sectional area 2mm^2 ?