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9 August, 23:20

3. Assume your electric bill showed you used 1355 kWh over a 30-day period. a.) Find the energy used, in kJ, for the 30 day period. b.) Find the energy used in J/day. c) At the rate of $.0749/kwh, what will your electric bill be for this month

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  1. 9 August, 23:22
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    4.87*10⁶ kJ

    1.63*10⁸ Joules

    1015 $

    Explanation:

    a. To convert the units, you can use this conversion factor:

    1 kWh = 3.6*10⁶J

    1355 kWh. 3.6*10⁶J / 1 kWh = 4.871*10⁹ J

    Now we convert to kJ → 4.87*10⁹ J. 1 kJ/1000J = 4.87*10⁶ kJ

    b. In 30 days, we used 1355 kWh so, let's determine the use by day

    1355 kWh / 30 day = 45.2 kWh

    Now we convert the 45.2 kWh to Joules → 45.2 kWh. 3.6*10⁶J / 1 kWh =

    1.63*10⁸ Joules

    c. We can make a rule of three, for this:

    1 kWh costs $0.749

    1355 kWh will pay (1355. 0.749) / 1 = 1015 $
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