The Resonator. When a wave hits the hole, part of it continues into the chamber and part of it is reflected. The wave travels through the chamber, hits the back wall of the muffler and bounces back out of the hole.he resonator is designed to work best in the frequency range where the engine makes the most noise; but even if the frequency is not exactly what the resonator was tuned for, it will still produce some destructive interference.
Although lahars contain at least 40% (by weight) volcanic ash and rock fragmentsâmaking them dense and viscous like wet concreteâthey actually flow faster than clear-water streams. These mudflows can rush down the flanks of a volcano at speeds as great as 40 miles (65 kilometers) per hour and can travel more than 50 miles (80 kilometers). Lahars that contain the most debris (as much as 90%) move the fastest and are the most destructive.
Les. Brown bears-are extremely fast, capable of running in short bursts as high as of 40 mph (64 km/h). Polar bears-have been clocked at a top speed of 35 mph (56 km/h), along a a road in Churchill, Canada. Grizzly bears-can reach top speeds of up to 30 mph (48km/h), but they can't maintain that speed for very long.