Se producen ondas sonoras estacionarias en un tubo de 1.2 metros de longitud. Para la fundamental y los dos primeros sobre tonos ¿en qué puntos del tubo (midiendo desde el extremo izquierdo) están los nodos de desplazamiento y los nodos de presión si a.) el tubo está abierto por ambos extremos; b.) el tubo está cerrado en el extremo izquierdo y abierto en el derecho.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Avalue that describes how heavy an object is and is related to the force of gravity is

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.