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  1. C

    Kirchhoff's Rules, system of equation problem

    I came up with three equations, to find three different currents in a DC circuit, using Kirchhoff's loop rule, but when I solved them as a matrix in my calculator the bottom row becomes all zero's and the first two rows do not appear to be in "rref" form. I solved the system of equations by...
  2. C

    Pendulum work/energy problem

    I am having dificulty with a problem involving a pendulum. Basically the pendulum is at rest at a specified hight. The pendulum is then allowed to swing and it strikes a cart at the base of it's arc and then the cart rolls up a ramp while the pendulum swings back to a lesser height than...