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ef152-lec-4-5 - near the tunnel entrance b The train’s...

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EF 152 Spring, 2009 Lecture 4-5 1 What is the 3 rd harmonic of a 20 cm diameter, 4 meter long organ pipe in a 55°F room? Module 4, Lecture 5 - Review A football (v=46 in 3 , w=15 oz) is immersed in water to a depth of 3 ft. What is the acceleration of the ball the instant it is released? EF 152 Spring, 2009 Lecture 4-5 2 A train sounds a whistle as it approaches a tunnel. The whistle has a frequency of 652 Hz, and the train travels with a speed of 21.2 m/s. a. What frequency is heard by a stationary person
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Unformatted text preview: near the tunnel entrance? b. The train’s engineer will hear both the initial frequency and the reflected frequency. What beat frequency will the engineer hear? EF 152 Spring, 2009 Lecture 4-5 3 A 4 m thick, 10 m tall, 20 m long concrete ( ρ =2500kg/m 3 ) dam creates an 8 m deep lake. Will the dam tip over if it is not fixed at the bottom? EF 152 Spring, 2009 Lecture 4-5 4 Find the pressure and velocity in the upper pipe....
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