Recent content by reallydumb

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    Solving for Power & Speed: A Homework Challenge

    Homework Statement Every 2km power is reduced by half. Initial power = 10watt. What is power after traveled 8km? C = 3x108. What is speed of light passing through optic fibre? n = 1.55Homework Equations P = \frac{w}{T} ? The Attempt at a Solution I don't know where to start
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    Solving for Water Temperature: 4000J Added to 400g at 20°C

    I started physics 2 months ago so I haven't a clue of most of the stuff in that link, we have'nt come across it yet Anyway nevermind :frown:
  3. R

    Solving for Water Temperature: 4000J Added to 400g at 20°C

    Thats why I asked because I really can't find it in the book or notes Please just tell me the equation xD
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    Solving for Water Temperature: 4000J Added to 400g at 20°C

    4000J of heat energy are added to 400 grams of water at 20 degrees celsius. What is the resulting temperature of the water? I know that I'm supposed to find Kelvin (K) but I'm not sure on which equation to use..