Why bullets are given cylinderical shape?

Why are rockets given conical shape ?

Magic bullets are the:

The fast moving vehicles are given streamline shape . Why ?

The given shape is a cylinder.

In the given figure, a cylinderical bar magnet is rotated about its axis. A wire is connected from the axis and is made to touch the cylinderical surface through a contact. Then, current in the Ammeter is.....

In a cylinderical pipe ( Fig.14.23), the area of the surfaces are given.Find the radius and height of the cyinder.

Why does the rising sun appear oval shaped ?

An infinite long straight conducting cylinderical shell of radius a is surrounded by a thin coaxial infinite conducing cylinderical shell of radius b . Assuming current flows uniformly through the cylinderical shell returns through the outer shell, the inductance per unit length for this arrangement is