Recent content by apparatus82

  1. A

    A battery drives an electric motor which raises a 20 kg mass at a steady speed.

    Scratch that. I got it now! Work done = Force x distance Power = Work done/ Time Therefore, Power = Force x Speed
  2. A

    A battery drives an electric motor which raises a 20 kg mass at a steady speed.

    1. A battery drives an electric motor which raises a 20 kg mass at a steady speed of 3m/s vertically upwards. If 90% of the electrical energy supplied is converted to mechanical energy and the current flowing is 5 A, find the emf of the battery. 2. W=QV p=mv P=IV K.E=.5mv^2 3...