Si un delfin emite un sonido y este es detectado por otro delfin luego de 3segundo a que distancia se encuentran?

An object has a weight of 500 on earth what is the mass of this object

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

What can you increase the strength of an electromagnet by