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Power problem Help!

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data

    I push two frictionless carts along a table, using a force of 10 N on each. Riding on one cart is a squid and on the other cart is a mango. They have the same mass. The squid's cart is moving at 2.0 m/s when I start pushing, in the same direction that I push. The mango's cart, on the other hand, starts from rest. Compare the power that I am delivering to each cart.

    Which of the following is correct?

    I am delivering more power to the cart with the squid.

    I am delivering more power to the cart with the mango.

    I am delivering the same power to both since the force is the same.



    2. Relevant equations

    P=F(V)


    3. The attempt at a solution

    I can substitute ma for force and V0 +(1/2)a(t) for V. But i have two unknows a and P.
    Am I applying more power to the cart with the squid because the initial velocity 2.0 ?
     
  2. jcsd
  3. Oct 7, 2012 #2
    Since P = FV, and F is the same, the question boils down to the comparison of the velocities. Can you say which one is greater? Is it always greater? Why?
     
  4. Oct 7, 2012 #3
    I need the acceleration to solve for the velocity...
     
  5. Oct 7, 2012 #4
    You have the force. Surely you can obtain acceleration.
     
  6. Oct 7, 2012 #5
    can i use 9.8 for acceleration? in that case squid has a greater velocity since it started at 2.0
     
  7. Oct 7, 2012 #6
    Why 9.8? Why not 370913.2?
     
  8. Oct 7, 2012 #7
    Where are getting that number from?
     
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