Helicobacter pylori (H. pylori) is a helically shaped bacterium that is usually found in the stomach. It burrows through the gastric mucous lining to establish an infection in the stomach's epithelial cells (see the photo). Approximately 90% of the people infected with H. pylori will never experience symptoms. Others may develop peptic ulcers and show symptoms of chronic gastritis. The method of motility of H. pylori is a prokaryotic flagellum attached to the back of the bacterium that rigidly rotates like a propeller on a ship. The flagellum is composed of proteins, is approximately 40.0 nm in diameter, and can reach rotation speeds as high as 1.50 103 . If the speed of the bacterium is 10.0 m/s, how far has it moved in the time it takes the flagellum to rotate through an angular displacement of 5.00 102