Question

Water emerges out of a garden hose pipe. Assuming flow is stream–lined which of the following statement is correct.

(1) When hose pipe is held vertically up the stream spreads like a fountain but narrows down when hose pipe is held vertically down.

(2) When hose pipe is held vertically up the stream narrows down and spreads like a fountain when hose pipe is held vertically down.

(3) There is no spreading or narrowing down of stream when hose pipe is held vertically up or down.

(4) There is no spreading or narrowing down of stream when hose pipe is held vertically down.

Answer 1

(1) When hose pipe is held vertically up the stream spreads like a fountain but narrows down when hose pipe is held vertically down.

When hose pipe is held vertically up the speed of water particles decreases as they move up. The pressure inside water increases as compared to pressure outside stream. The stream therefore spreads out like a fountain.