Recent content by lydigihome

  1. L

    Physics-current electricity, circuit

    oh, some small amendment: that 15ohm at the top righthand corner should be 10ohm
  2. L

    Physics-current electricity, circuit

    Homework Statement [PLAIN]http://img208.imageshack.us/img208/4577/physicso.jpg Homework Equations The Attempt at a Solution dont know how to do.. help please, how can i find that is 4V?
  3. L

    Total mass of the earth's atmosphere

    Homework Statement given: atmospheric pressure near the Earth's surfact=100kPa density of the air near the Earth's surfact=1.3kg/m-3 radius of the earth=6400km the best estimate for the total mass of the Earth's atmosphere: 5x1018 kg. how to work out this value?? Homework...