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Homework Help: Momentum and Impulse Homework-Help Please

  1. Mar 15, 2010 #1
    1. The problem statement, all variables and given/known data
    A bronze statue of Bhudda was completed in Tohyo in 1993. The statue is 35 m tall and has a mass of 1,000,000 kg. Suppose this statue were to be moved to a different location. What is the magnitude of the impulse that must act on the statue in order for the speed to increase from 0 m/s to .2 m/s? If the magnitude of the net force acting on the statue is 12.5 kN, how long will it take for the final speed to be reached?


    2. Relevant equations
    p=mv


    3. The attempt at a solution
    I have no idea where to begin...
     
  2. jcsd
  3. Mar 15, 2010 #2

    Filip Larsen

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    Gold Member

    Impulse is change in momentum. Using the formula for momentum you gave, what are the momentum of the Bhudda at rest and what is it when it moves with 0.2 m/s? The difference between these two is the the impulse.

    In order to find the time it takes to accelerate the Bhudda you need establish how impulse, that is change in momentum over time, and force are related. Its a very simple relationship.

    An alternative, but a slightly bit more involved way would be to look at how force, mass and acceleration are related and how (constant) acceleration, speed and time are related.
     
  4. Mar 15, 2010 #3

    berkeman

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    Staff: Mentor

    Welcome to the PF. What is the definition of Impulse? Is time involved?

    http://en.wikipedia.org/wiki/Impulse

    .
     
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