Phys200 Practice Final Exam Solutions 2005

Phys200 Practice Final Exam Solutions 2005 - Physics 200...

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Physics 200 Practice Final (Sketchy, as in outlined) Solution I. (i) In time t the heater will have provided energy Q heater = Pt , where P is the power. We frst compare this to the amount o± energy needed to get the water to the boiling point (the symbols should be relativity sel±-explanatory; we will keep all the quantities positive here): Q boil = ( m Al c Al + m water c water T boil , which turns out to be larger than Q heater . So the water will not boil, and we can fnd the fnal temperature with T = T 0 + Δ T = T 0 + Q heater m Al c Al + m water c water . Let the the denominator be α ±or the next part. (ii) It’s clear this time that the water will not get to the boiling point. Let R be the rate o± rain, so that the amount o± rain±all is Rt , and let T be the fnal temperature with the rain mixed in. Then α ( T - T ) + ( Rt ) c water ( T - T rain ) = 0 , which gives T = αT + Rtc water T rain α + Rtc water . II. Let
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Phys200 Practice Final Exam Solutions 2005 - Physics 200...

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