Un grúa cuyo rendimiento es del 50% está instalada a un motor cuyo rendimiento es del 80%. Si al motor se le
proporciona una potencia de 800watt, calcular la
velocidad constante con la cual podrá subir un bloque e
masa 1kg (g = 10m/s2)
Help me, please :(

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz