Question

While filming an intense action sequence for the next James Bond movie, a controlled explosion detonates 1.1 km away from the actors. If the speed of sound through solid rock is 3000 m/s on average, the actors will feel the explosion before they hear it. How much time will pass between when they feel the explosion and when they hear it?

Answer 1

The time that will pass between the feeling and hearing the explosion is 2,86 secs

Step-by-step explanation:

First, let's calculate the time that the wave takes to travel until the actors feel the explosion:

`1,1 km*(1.000 mts)/(1 km) *(sec)/(3.000 mts) = 0,37 secs`

Now, the time that pass while the actors hear the sound is:

(Remember that the sound speed in the air is 340 m/s on average)

`1,1 km * (1.000 mts)/(1 km) * (sec)/(340 mts) = 3,23 secs`

So, the time between the feeling and hearing is 3,23 - 0,37 = 2,86 secs