Final answer:
Flow rate and velocity are related in physics, specifically in the context of fluid flow. The greater the velocity of a fluid, the greater the flow rate. The relationship between flow rate and velocity can be expressed using the equation Q = AU.
Step-by-step explanation:
Flow rate and velocity are related, but quite different, physical quantities. The flow rate of a river depends on the velocity and the size of the river. The greater the velocity, the greater the flow rate. For example, the Amazon River in Brazil has a much higher flow rate than a rapid mountain stream because it is larger and has a higher velocity. The precise relationship between flow rate and velocity is given by the equation Q = AU, where Q represents the flow rate, A is the cross-sectional area of the flow, and U is the average velocity of the flow.