Calcule la frecuencia fundamental y la de los tres primeros sobre tonos de un tubo de 45 cm de longitud a.) si está abierto en ambos extremos; b.) si está cerrado en un extremo. Use v=344 m/s; c.) determine el número del armónico más alto que podrá oír una persona con oído normal (que puede oír a frecuencias de 20 a 20,000 Hz) para cada uno de los casos anteriores.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Alandscaper is shopping for landscaping materials. she wants to use materials through which water flows easily. which materials should she choose? check all that apply. clay gravel granite rocks with cracks loosely packed soil