- #1
bac2789
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I've always chuckled when I look up in my classroom and see the poster my physics teacher owns asking "How long would you have to yell to heat up a cup of coffe?". It would take an impracticle amount of time for a single person, however, with a twist this question could turn into quite the amusing experiment (granted it would take an enormous group of people). I figured you forum helpers must get bored every now and then, so I have a question for you! Yes, this is a spin on things, a pop-quiz from a student for all you teachers out there ;)
My question to you is:
How many people would have to yell for 60 sec to heat up an 8oz cup of coffe from room temperature (70°F) to a toasty 70°C? (Note: The average person yells at about 80 decibles)
Assume a perfect transfer of energy from your yell to the coffee, a perfectly insulated cup that will never let any heat escape, and an unending even stream of energy.
Cant you just feel your tastebuds tingling with excitement!?
Be sure to post your:
1. Givens and Unknowns
3. Work and solution
My question to you is:
How many people would have to yell for 60 sec to heat up an 8oz cup of coffe from room temperature (70°F) to a toasty 70°C? (Note: The average person yells at about 80 decibles)
Assume a perfect transfer of energy from your yell to the coffee, a perfectly insulated cup that will never let any heat escape, and an unending even stream of energy.
Cant you just feel your tastebuds tingling with excitement!?
Be sure to post your:
1. Givens and Unknowns
Homework Equations
3. Work and solution
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