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Work problem(s)

  1. Jan 16, 2014 #1
    1. The problem statement, all variables and given/known data
    A hot air balloon of mass 425 kg ascends from the ground level and accelerates at a rate of 1.25 m/s/s for 25 seconds. How much work is done by the upward buoyant force on the balloon?

    (conceptual) A certain amount of work W is required to accelerate a car from rest to a speed of v. How much work is required to accelerate from rest to a speed of v/2?

    2. Relevant equations
    W=fd
    Fnet=ma
    KE=1/2mv^2


    3. The attempt at a solution

    I tried to find Fnet first, so would it be the upward buoyant force (what is trying to be solved)+mg (weight)= 425x1.25. Then find the displacement using one dimensional motion, getting 390.625 m traveled. Is all this right? How do I proceed?

    Rearranged W=1/2m(v/2)^2 to 4w=1/2mv^2. How do I proceed? I'm solving for work required.
     
  2. jcsd
  3. Jan 17, 2014 #2

    jedishrfu

    Staff: Mentor

    Cant you simply compute the height the balloon reached and then use PE=mgh ?
     
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