los murcielagos se orientan en la oscuridad emitiendo ondas de ultrasonido que, al relajarse con los objetos, le proveen informacion sobre su ubicacion¿ porque usan ondas de frecuencia muy altas?

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.

Which component of the earth’s atmosphere is decreased due to photosynthesis?

Which of the following statement is false ? a. batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c. do not stack batteries on top of each other)d. never put a damaged battery in a dumpster. i