Friday

August 1, 2014

August 1, 2014

Posted by **Trace** on Thursday, March 3, 2011 at 10:42pm.

of her. At the bottom of her swing when she is moving toward the whistle, she hears the higher

pitch, and at the bottom of her swing, when she is moving away from the swing she hears a lower

pitch. The higher pitch has a frequency that is 5.0% higher than the lower pitch. What is the

speed of the child at the bottom of the swing?

I think I need to use the equation

freq observed=[(1-v child)/v sound]freq sound

I know the v sound =343 m/s but I have no idea even where to start on this question.

- physics -
**Trace**, Thursday, March 3, 2011 at 11:21pmokay, so I set it up as a ratio:

[(1-v child)/v]*freq sound

OVER

[(1+v child)/v]*freq sound

ALL THAT =1.05

So I have 1.05=[(1-v child)/343]/[(1+v child)/343]

But I can't figure out how to manipulate this equation. I keep getting the v child as 341 m/s, and I know that kid is not moving that fast! How do I finish this equation?

- Never mind I got it!! -
**Trace**, Thursday, March 3, 2011 at 11:28pmI guess I gave up too soon!

**Related Questions**

Physics - A 35kg child is swinging on a swing with length 2.8m to the bottom of...

Physics - A child of mass 40.0 kg is swinging on a swing with ropes of length 4....

physics - A child swings on a playground swing. How many times does the child ...

Physics - A 50- kg child sits in a swing suspended with 3.8- m-long ropes. The ...

Physics PLEASE HELP - A 80- kg child sits in a swing suspended with 2.6- m-long ...

PHYSICS PLEASE HELP - A 80- kg child sits in a swing suspended with 2.6- m-long ...

Physics - A 40 kg child sits in a swing suspended with 2.5 m long ropes. The ...

physics - Draw the figure, and calcuate the height above the bottom point the ...

Physics - A gymnist is swinging on a high bar. The distance between his waist ...

physics - A gymnast is swinging on a high bar. The distance between his waist ...