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(8 pts) A string with linear mass density of 0.00200 kg/m is attached to a wall, passed over a pulley and pulled taught with a weight as shown. When the weight has a mass of 5.00kg, the fundamental frequency of the string is 250Hz. What is the length of the string from point A to the pulley? Im(10 pts) A police car siren emits 120W of sound at a frequency of 1200Hz a. What is the intensity of the sound in decibels at a distance of 500m from the siren? b. If the police car, travelling east at 200 km/hr chases a speeding motorist going east at 140 km/hr. What is the siren frequency as heard by the motorist?

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Answer #1

Concept :- we find the tension in the string using Newton's law of motion, then we use the properties of wave motion on string to find the wave speed, and then find the length using the fundamental frequency,

4 N L56: 52 m/s 250Hz 156 52 -15 2 L 513***************************************************************************************************
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