1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need some Help

  1. Apr 9, 2005 #1
    I have two more questions for anyone can help....
    1. A frog in a hemispherical pod finds that he just floats without sinking in a fluid of density 1.25 g/cm3. If the pod has a radius of 9.00 cm and negligible mass, what is the mass of the frog?
    2. A cowboy at a dude ranch fills a horse trough that is 1.6 m long, 60 cm wide, and 40 cm deep. He uses a 1.9 cm diameter hose from which water emerges at 1.4 m/s. How long does it take him to fill the trough?

    Just need some direction...no answer.
     
  2. jcsd
  3. Apr 9, 2005 #2

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    For the first problem:HINT:The buoyancy force must be equal to the gravity force...

    For the second:what is the colume of the trough?What is the flow through the hose...?

    Daniel.
     
  4. Apr 9, 2005 #3
    I still don't understand how you begin the problem....do you divided 9 cm by 1.25 g/cm^3?
     
  5. Apr 9, 2005 #4
    Firstly, you must understand the definition of The buoyancy force. Do you know what that is and how to calculate it ???

    marlon
     
  6. Apr 10, 2005 #5
    Anyone help?
     
  7. Apr 10, 2005 #6

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Yeah.U've been asked 2 questions above.Can u answer them?

    Daniel.
     
  8. Apr 10, 2005 #7
    Yeah, the pod partially submerged in the fluid experiences the bouyant force equal in magnitude to the weight of the fluid displaced by the pod.
    To calculate it B=PfluidVg=wfluid ?
     
    Last edited: Apr 10, 2005
  9. Apr 10, 2005 #8

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    [itex] F_{B}=\rho_{fluid}V_{body}g [/itex]...

    And u need to know the volume of the immersed body.

    Daniel.
     
  10. Apr 10, 2005 #9
    how do you find the volume of the immersed body?
     
  11. Apr 10, 2005 #10

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    I can only assume that all the hemisphere is immersed.The problem is not to explicit,so you have to make assumptions,in order to get a result.

    Daniel.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Need some Help
  1. Need some help ^-^ (Replies: 2)

  2. Need some help (Replies: 13)

Loading...