PHY2020_Exam3_SOLUTIONS

# PHY2020_Exam3_SOLUTIONS - PHY2020 Fall 2011, Test 3 I...

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PHY2020 Fall 2011, Test 3 I understand that the University of Florida expects its students to be honest in all their academic work. I agree to adhere to this commitment to academic honesty and understand that my failure to comply with this commitment may result in disciplinary action up to and including expulsion from the University. Name: _____________________________________________________ UF ID: _____________________________________________________

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Ignore air friction in all problems. Please give complete responses to all questions including units and theoretical justification for responses. You must show ALL of your work to receive full credit! Useful values and formulas: 1 km = 0.62 miles = 3280.8 feet 1 m = 39.37 inches 1 kg = 2.2 lbs 101 kPa = 760 mg Hg ρ water = 1 g/cm 3 = 1000 kg/m 3 1 Cal = 4.18 Joules c water = 1.0 kcal/kg °C
1. (10 pts) A train emits a sound at 1645 Hz. The train is moving towards an observer with a speed of 150 km/hr. If the observer hears a frequency of 1400 Hz, what is the speed and direction of the observer? f = f 0 v + v r v + v s 1400 Hz = 1645 Hz * (343 m/s + v r ) 343 m/s – (150 km/hr * 1 hr/3600 s * 1000 m/1km) 1400 Hz = 1645 Hz * (343 + v

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## This note was uploaded on 12/15/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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PHY2020_Exam3_SOLUTIONS - PHY2020 Fall 2011, Test 3 I...

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