There are an infinite variety of shapes and dimensions
that one cubic foot of space can have.
There is no three-dimensional volume (cubic feet) in a one-dimensional length (foot).
This question cannot be answered in a sensible way. A cubic foot is a measure of volume, with dimensions [L3]. A kilogram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information. One cubic foot of air will have far less mass than a cubic foot of lead.
A cubic foot that is three inches thick covers an area of 4 square feet. This is an area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. There is no sensible way to convert one to the other.
To calculate cubic volume you need to know all three dimensions, length, width, and height. A cube foot is one foot by one foot by one foot. Something a foot wide and a foot long, but only 6 inches high, would be .5 cubic feet.
A cubic foot measures 12" x 12" x 12", so it contains 1728 cubic inches. Therefore, half a cubic foot is 1728/2, or 864 cubic inches. But the implication of the original question is PROBABLY meant to be -- what are the dimensions of a cube if its volume is one-half of a cubic foot? The exact answer, expressed in inches, is: (the cube root of 864) x (the cube root of 864) x (the cube root of 864); or, for practical purposes, just a little larger than 9.5" x 9.5" x 9.5".
Cubic is 3 dimensional (height, width, depth) whereas square is two dimensional (height, depth).
steel
One cubic foot is about 0.0283 cubic meter.
The question, as stated, cannot be answered sensibly. A cubic second is a measure of time cubed, with dimensions [T3]. A foot is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
The question, as stated, cannot be answered sensibly. A cubic metre is a measure of volume, with dimensions [L3]. A [running] foot is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
1ft3 (one foot cubed; or one cubic foot)
Cubic feet is a measure of volume, requiring three dimensions. Inches are a one-dimensional measurement. However, there are 1728 cubic inches in a cubic foot, so .39 * 1728 = 673.92 cubic inches.