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9 February, 11:36

What is the energy equivalent of 5.0kg of mass?

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  1. 9 February, 13:13
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    Ah hah! Sounds to me like an " E = m c² " question.

    c = 3 x 10⁶ m/s

    c² = 9 x 10¹² m²/s²

    E = (5 kg) x (9 x 10¹² m²/s²)

    = 45 x 10¹² kg-m²/s²

    = 4.5 x 10¹³ newton-m

    = 4.5 x 10¹³ Joules.

    That's the energy needed to

    - - run a 1000-watt blow-dryer for roughly 1,427 years.

    or

    - - run a 400-horsepower truck, wide open, pedal to the metal,

    for 4.78 years.
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