Physics

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?

  1. 👍 0
  2. 👎 0
  3. 👁 106
  1. 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

    1. 👍 0
    2. 👎 0
    posted by Damon
  2. Try some of the Physics Tutorials:

    http://search.yahoo.com/search?fr=mcafee&p=Physics+tutorial

    Sra

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. AP Physics

    At a height of 5 meters above the surface of a freshwater lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.140 s later. The air and water temperatures are 20°C. How deep is

    asked by Alan on February 9, 2011
  2. Math

    Sadiq dropped his watch into a lake. The depth of the lake is 5 meters. Sadiq can dive down towards the bottom of the lake at a speed of 2 meters per second, but can swim upwards at a rate of 1 meter per second. How long will it

    asked by Sadiq on September 7, 2014
  3. physics

    a ship sends a snoar pulse of frequency 30kHz and duration 1.0 ms towards a submarine and receives a reflection of the pulse 3.2 s later. the speed of sound in water is 1500 ms-1. find the distance of the submarine from the

    asked by sake on April 7, 2008
  4. physics

    An airplane wants to drop a load of fish inot a small lake in the mountains. The plane is flying at its min speed 40 m/s, and is 50 meters above the surface of the lake. a.) Where relative to the lake should the plane be when the

    asked by Jackie on September 16, 2007
  5. Physics

    The speed of sound is about 340 m/s. Assume that when the motion detector emits an ultrasonic pulse, it must detect the reflected pulse before it can emit its next pulse. Assuming that the length of the air track is about 2

    asked by Priscilla on February 26, 2012
  6. math

    rozana,a fisherwomen throws her net in a lake.the net falls in the lake when it is 2 meters above the ground at 5 meters per second at angle of 60 degrees.(assume that the acceleration due to gravity is -9.8m/s^2).find the vector

    asked by arini sofia on May 22, 2016
  7. math

    rozana,a fisherwomen throws her net in a lake.the net falls in the lake when it is 2 meters above the ground at 5 meters per second at angle of 60 degrees.(assume that the acceleration due to gravity is -9.8m/s^2).find the vector

    asked by arini sofia on May 22, 2016
  8. calculus

    An artificially created lake is bordered on one side by a straight dam. The shape of the lake surface is that of a region in the xy-plane bounded by the graphs of 2y=16-x^2 and x+2y=4. Find the area of the surface of the lake.

    asked by Akki on February 17, 2015
  9. Physics

    A bat in a cave emits a sound pulse and receives an echo 0.15 second later. Assuming that the speed of sound is 345 m/s, how far did the sound (a longitudinal wave!) travel during this time?

    asked by Anonymous on February 4, 2014
  10. Social Studies

    Lake Michigan and Lake Huron have the same surface elevation of ___ feet 577? The ___ Channel connects Lake Huron Lake St Clair and Lake Erie South? Niagara Falls is between Lake Erie and Lake __ Ontario? Lake Ontario is connected

    asked by Jerald on November 12, 2012

More Similar Questions