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Homework Help: Power and Work

  1. Oct 16, 2012 #1
    1. The problem statement, all variables and given/known data
    The initial kinetic energy imparted to a 0.0190 kg bullet is 1008 J.
    (a) Assuming it accelerated down a 1.00 m long rifle barrel, estimate the average power delivered to it during the firing.

    (b) Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained.

    2. Relevant equations
    KE = (mv^2)/2
    P = dW/dt or Fv
    3. The attempt at a solution
    I found the final velocity which is 326
    BUt I can't find the force.

    How can I find the maximum height without knowing the angle
  2. jcsd
  3. Oct 16, 2012 #2
    And what's actually the formula for average power.
    I doubt P = Fv is right
  4. Oct 17, 2012 #3
    Can anyone help me ? :(

    Thank you...
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