What frequency does a cop hear

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Reference no: EM13273778

1) A burglar alarm is wailing with a frequency of 1200 Hz. What frequency does a cop hear who is driving towards the alarm at a speed of 40.0 m/s? ( Answer : 1336 HZ)

2) A car approaching a stationary observer emits 450 HZ from its horn. If the observer detects a frequency of 470 HZ., how fast is the car moving? speed of sound is 343 m/s (Answer : 15m/s )

3) A carnot engine operates between 20 and 500 degress celcius. How much energy must be supplied to produce 10000 J of work? (Answer 16000 J)

4) Calculate the change in entropy when a 156 gram of ice melts at 0 degrees celcius?

Reference no: EM13273778

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