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Q. Standing at a crosswalk, you hear a frequency of 540 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 430 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.)

Q. A bottle containting 3kg of water at a temperature of 20 degrees celcius is placed in a refridgerator where the tmperature is kept at 3 degrees celcius. How much heat is transferred from the water to cool it to 3 degrees celcius?

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Category:- Physics
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