What does a vector's curl mean in practice?

A landscape architect is planning an artificial waterfall in a city park. Water flowing at 0.536 m/s will leave the end of a horizontal channel at the top of a vertical wall h = 2.40 m high and falls into a pool (see figure). (a) How far from the wall will the water land? m Will the space behind the waterfall be wide enough for a pedestrian walkway? (Assume the water must land 2 m from the wall to provide adequate space for a person to walk beneath the waterfall.) Yes No (b) To sell her plan to the city council, the architect wants to build a model to standard scale, one-fifteenth actual size. How fast should the water flow in the channel in the model? m/s

Vector 12.2. Solve this using vectors

The force F is applied 45 degrees counter clockwise from the surface of the slope. The slope is 20 degrees counter clockwise from the horizontal. The magnitude of F is 60lbs. Determine the magnitude of the Force F applies along the slope