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Doppler effect quick question

  1. Jul 26, 2009 #1
    doppler effect quick question!!!!

    1. The problem statement, all variables and given/known data

    An ambulance traveling at speed 31 m/s is producing a loud sound of frequency 895 Hz. You see the ambulance in your rear view mirror as the ambulance approaches you and you slow down to 14 m/s as a law obeying citizen (hehehe we know now).

    2. Relevant equations

    fo=fs((v +- Vo)/(v+-Vs))

    should it be:

    895 (330-14)/(330-31)???

    3. The attempt at a solution
     
  2. jcsd
  3. Jul 27, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: doppler effect quick question!!!!

    You are wright.
     
  4. Jul 27, 2009 #3
    Re: doppler effect quick question!!!!

    hi, thanks so much! i got that one... will you look at this one? I feel like I am so close.

    https://www.physicsforums.com/showthread.php?p=2286412#post2286412

    OR

    A chunk of carbon steel with density, ρ = 7.84 g/cm3 , is completely submerged in fresh water. The chuck of steel weighs 39 N more in air than in water. Please answer the following:
    (a) Find the buoyant force acting on the chuck of steel.
    N
    (b) Find the the volume of the chuck of steel.
    m3
    (c) What is the mass of the chuck of steel?

    2. Relevant equations


    Fw(air)=Fw(water) + 39 N

    d=m/v

    Fb=gp(f)V

    BUT I dont know how to find the volume.

    density of air is 1.16 kg/m3
    density of water is 1.0x10^3


    3. The attempt at a solution

    once I get the VOLUME I can find the relative weights by using rho*g*v
    and Fw(water)+ 39N = Fw(air)
     
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