Yes, it can.
It is 13/3 units.
The surface area of the 'wall' doubles, but the base areas remain the same.
The volume of the cylinder would be doubled.
3 times
You cannot find the height and diameter of a cylinder by knowing the volume only. There are infinite combinations of height and diameter that will result in the same volume. You need to know either the diameter or the height in addition to the volume to calculate the remaining unknown. Volume = pi/4 * d2 * h (note: pi/4 * d2 is the same as pi * r2)
Draw a rectangle for the side of the cylinder and on top and bottom of this rectangle 2 circles for the base and the top of the cylinder The rectangle width would be the diameter of the circle large and the same height that the cylinder
168 pi sq cm
In that case, the volume will also be the same.
The volume is Base x height; the Base area is the same as the formula for a circle - which is proportional to the square of the radius. For example, if you double the radius (or the diameter, or the circumference) of a circle, its area will quadruple.
A sphere's height will always be the same as its diameter.
It is a cylinder
If the area of the base and the height of the cylinder and the cone are the same, then the volume of the cone will always be one third of the volume of the cylinder.