Posted by Kristina on Friday, February 11, 2011 at 3:12pm.
At a height of 15 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.150 s later. The air and water temperatures are 20°C. How deep is the lake?

Physics  Damon, Friday, February 11, 2011 at 3:50pm
look up speed of sound in water at 20C
call it Cw
look up speed of sound in air at 20C
call it Ca
then distance in water = 2d
distance in air = 30
time in water = t
time in air = (.15 t)
then
time in air = 30/Ca = .15  t
solve for t
then
Cw t = 2 d

Physics  SraJMcGin, Friday, February 11, 2011 at 4:50pm
Try some of the Physics Tutorials:
http://search.yahoo.com/search?fr=mcafee&p=Physics+tutorial
Sra
Answer This Question
Related Questions
 AP Physics  At a height of 5 meters above the surface of a freshwater lake, a ...
 physics  A hiker determines the length of a lake by listening for the echo of ...
 physics  An airplane wants to drop a load of fish inot a small lake in the ...
 math  Surfact of A lake is 31 feet above the surface of B lake. B lake is half ...
 arithmetic  a flower floats on the surface of lake water. its level above the ...
 physics  A hiker determines the length of a lake by listening for the echo of ...
 physics  a boy stands on a cliff overlooking a lake below. He throws a rock at ...
 PHYSICS  Waves  Can someone tell me how to get the answer to this question? ...
 Math  Sadiq dropped his watch into a lake. The depth of the lake is 5 meters. ...
 Physics  The maximum depth of Lake Baikal, in Russia, is 1637 m, making it the ...
More Related Questions