# I Mechanical waves Homework

#### Markzhongwen

Hello everyone I couldn't figure it out a simple way to solve 15. 11 C . Please help ! Very appreciated!!!

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#### Simon Bridge

Homework Helper
What have you tried?

#### Markzhongwen

Thank you so much for your attention ,Actually I do not have a clue how o do it . My instructor said the way to solve it is very complicated. So can you give me a hint or tell how to do that .Thank you again .

#### olivermsun

Suppose you are looking at a wave traveling past you. What does wave speed mean, in relation to what you are seeing?

Now how does the figure relate to the wave speed?

#### Simon Bridge

Homework Helper
I don't think it is complicated so much as requires that you understand the physics somewhat.
ie. how would you normally be able to find out the speed of something - say, a car?

#### Markzhongwen

The distance / time = velocity . But I do not jab the time here .

#### berkeman

Mentor
Thread locked. @Simon Bridge -- please PM the OP and explain the PF Homework Help rules.

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