Aforce acting between two surfaces that are touching is

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?