Recent content by RB_Physics

  1. R

    Changes in Mechanical Energy for non-conservative Forces Problem

    Vf = sqrt[((k(xi)^2) - (2fd)) / m] I don't know how but I keep getting .506 m/s... k*(xi)^2 = .02 2*f*d = .0064 .02 - .0064 = .0136 .0136 / .053 kg = .257 sqrt(.257) = .506 m/s... You say you're getting 1.40 m/s but you can't with that formula, I've checked and my...
  2. R

    Changes in Mechanical Energy for non-conservative Forces Problem

    A toy cannon uses a spring to project a 5.30 g soft rubber ball. THe spring is originally compressed by 5.00 cm and has a force constant of 8 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon and the barrel exerts a constant friction force of .032...
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