Question

GENTE ME AJUDEM NESTA QUESTÃO POR FAVOR, TENHO PROVA ONLINE AMANHÃ! "Um sonar de um navio de pesca localizou um cardume de sardinhas a 300 m de profundidade. Sabendo que a velocidade de propagação do som na água tem o valor de 1500 m/s, calcula o tempo que decorre desde a emissão dos ultra-sons e a sua receção no navio." Por favor!

Answer 1

The time between the emission of the wave and it's reception was 0.4 seconds.

Step-by-step explanation:

The sound wave emitted by the sonar traveled from the boat to the fishes and came back, therefore the distance of it's total route is twice the distance from the boat to the fishes. We can apply the average speed formula in order to solve this problem, this is done below:

`\text{speed} = \frac{\text{distance}}{\text{time}}`

We were given the distance traveled by the wave and it's speed, therefore we can solve for the time:

`\text{time} = \frac{\text{distance}}{\text{speed}}\\\\\text{time} = ((2*300))/(1500)\\\\\text{time} = (600)/(1500) = 0.4 \text{ s}`

The time between the emission of the wave and it's reception was 0.4 seconds.