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.
Distance, Conditions and Speed. A sled dog's speed depends on a variety of factors, including weather, the planned travel distance and the condition of the trail. For shorter distances, sled dogs may average 10 to 14 miles per hour during the course of a day of mushing. If conditions are poor, such as extreme cold or fresh snow, the dogs' speed can drop to 6 or 7 miles per hour. In a sprint race that takes a day or two, sled dogs may reach up to 15 miles per hour. The size of the sledding team makes a difference; however, the team will travel only as fast as its slowest member. As well, the amount of weight the team is pulling will affect its overall speed.