Volume = cross sectional area * lengthArea = 2* cross sectional area + perimeter of cross section * length
If the diameter doubles (x2), the cross-sectional area quadruples (x4).
Other things being equal, more cross-sectional area will cause less resistance.
9 AWG
It depends on what you mean by a 30 pipe. Is 30 the cross sectional area - in which case, what is the length of the pipe? Is 30 the length - in which case, what is the cross-sectional area?
cohort-sequential
Cross sectional
Cross sequential studies combine both longitudinal and cross sectional methods in an attempt to both shorten the length of the research and minimize developmental assumptions
cross-sectional
Cross-sectional research design allows for data collection at a single point in time, providing a snapshot of a population's characteristics. It is relatively quick and cost-effective compared to longitudinal studies. It can identify correlations between variables and is useful for generating hypotheses for further investigation.
advantage of cross sectional study?
You cannot create a cross sectional area of a rectangle. You can only create cross sectional areas for triangular shapes.
Cross-sectional research studies a group of individuals at one specific point in time to understand relationships or differences between variables. Longitudinal research, on the other hand, involves studying the same group of individuals over an extended period to track changes and development in variables of interest.
The quickest way to study changes over the life span is through cross-sectional research. Cross-sectional studies (also known as Cross-sectional analysis) form a class of research methods that involve observation of some subset of a population of items all at the same time, in which, groups can be compared at different ages with respect of independent variables, such as IQ and memory ... Source: en.wikipedia.org/wiki/Cross-sectional_research
The quickest way to study changes over the life span is through cross-sectional research. Cross-sectional studies (also known as Cross-sectional analysis) form a class of research methods that involve observation of some subset of a population of items all at the same time, in which, groups can be compared at different ages with respect of independent variables, such as IQ and memory ... Source: en.wikipedia.org/wiki/Cross-sectional_research
the larger the cross sectional area, the smaller the resistance
To calculate the cross-sectional area of a shape, you need to determine the shape of the cross-section first (e.g., square, circle, triangle). Then, use the appropriate formula for that shape. For example, the formula for the cross-sectional area of a square is side length squared, for a circle it is pi times the radius squared, and for a triangle it is base times height divided by 2. Finally, plug in the given dimensions into the formula to calculate the cross-sectional area.