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MidTerm2

# MidTerm2 - PHY 126-07 Mid-term Exam II Chapters 15,16,17,18...

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PHY 126-07 Mid-term Exam II Chapters 15,16,17,18 You need to write how you have derived the answers. Just writing an answer does not get you the full point. When you use symbols that you define, make clear what these symbols represent. Problem 1 (10+10 points) A scientist is making a mockup model of a human ear using a small can with the top surface open and the bottom closed. A human ear is especially sensitive to sound whose frequency is 3,440 Hz. If this is the lowest frequency that the ear is especially sensitive to, (a) what the height of the mockup model h should be? Assume that the speed of sound is 344 m/s. (b) What is the next lowest frequency the ear especially sensitive to? open closed h

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Problem 2 (3+3+3+3+3+5 points) 6.00 kg of ice at -5.00 o C is added to a cooler holding 30 liters of water at 20.0 o C. The density of water is 1000 kg/m 3 . The latent heat of fusion of water L f is 3.33 x 10 5 J/kg, the specific heat of water c water and ice c ice are 4190 and 2090 J/(kg K), respectively.
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