Answer:
Fluid mechanics covers a broad spectrum of topics. If you stay at the base level and look at what it can cover if you dive into all the different topics, here is a list I can think of off the top of my head (from what I deal with to what other people deal with):
Biological applications; things like bloodflows in the body (R&D)
Automotive Industry; branches and intertwines with flows over vehicles and reducing backdrafts as well as minimizing drag
Hydroelectric power sources; calculating flows to determine the power capability of a certain area
Explanation:that your answer