You are down at the railyard at 4: 30 am to watch a taping of an alias episode. you watch as a train goes by at 5.0 m/s south. on top of the train, agent sydney bristow is running north. you see sydney moving at 8.0 m/s north. at what speed does the camera crew on the train see sydney running, and in what direction?

The speed is 13 m/s

Explanation:

In this problem, we have two reference frames:

- The reference frame of the observer on the ground, O

- The reference frame of the observes on the train, O', moving with velocity with respect to O (here we have taken north as positive direction, so since the train is moving south, we wrote it as a negative number)

For the observer on the ground, O, Sydney is moving with velocity

(positive because it's moving north)

So, we can find Sydney's velocity with respect to the frame O' as follows

So, the camera crew on the train observe Sydney moving at 13 m/s north

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.