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anonymous

  • 5 years ago

Determine the change in thermal energy of a 30 kg wooden bench that warms from 15oC to 25oC if the specific heat of wood is 1,700 J/(kgoC). Show formula and work.

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  1. anonymous
    • 5 years ago
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    Is it ? Q = m(Tf - Ti)C Q = 30kg(15C-25C)1,700 J/(kgC) Q = -510,000 ?

  2. JamesJ
    • 5 years ago
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    Doesn't the energy have to go up?

  3. anonymous
    • 5 years ago
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    Yeah ?

  4. JamesJ
    • 5 years ago
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    So the answer should be positive. Check your signs.

  5. anonymous
    • 5 years ago
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    It should be 510,000 J ?

  6. JamesJ
    • 5 years ago
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    Yes. Tf = 25 and Ti = 15, hence Tf - Ti = +10, not -10

  7. JamesJ
    • 5 years ago
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    Always sense check your answers in Physics. Ask yourself what the answer means and whether it is consistent with what you're trying to do.

  8. anonymous
    • 5 years ago
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    Thanks again . :)

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