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Homework Help: Insulated Copper Block Heated to 60 Celsius

  1. Feb 6, 2013 #1
    1. The problem statement, all variables and given/known data
    An insulated copper block receives energy at a rate of 100 W from an embedded resistor. If the block has a volume of 10-3m3 and an initial temperature of 20°C, how long would it take, in minutes, for the temperature to reach 60°C?

    2. Relevant equations

    Copper specific heat = 0.385 KJ/Kg°K

    Copper Density = 8930 Kh/m3

    Q' = du/dt + d(KE)/dt + d(PE)/dt + W but there is no kinetic energy, potential energy or work done

    Q = mcΔT

    3. The attempt at a solution

    Initially, I found the mass of the copper

    mcopper = (8930 Kg/m-3)(10-3m3)
    mcopper = 8.930 Kg

    But I'm not sure if this will help me.

    How do I interpret the energy give? Is the 100 W = Q?
  2. jcsd
  3. Feb 6, 2013 #2


    User Avatar

    Staff: Mentor

    A watt is a unit of power, and the common name for the unit grouping: Joules/second.

    Multiply watts by time to obtain the energy delivered over that time.
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