# Answer to Question #72986 in Mechanics | Relativity for manjula

Question #72986

An ambulance siren has frequency 250 Hz. The ambulance is headed towards an

accident site with a speed of 90 km/h. Two police officers on separate motor

cycles head for the same accident site: one follows the ambulance with a speed of

80 km/h. and the other approaches the accident site from the other direction with a

speed of 80 km/h. What frequency does ambulance siren has for each of the police

officers? Take the speed of sound equal to 340 m/s

.

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## Comments

Assignment Expert07.02.18, 15:09Dear visitor,

please use panel for submitting new questions

abhi07.02.18, 05:31A girl is sitting with her dog at the left end of a boat of length 10.0 m. The mass of the

girl, her dog and the boat are 60.0 kg, 30.0 kg and 100.0 kg respectively. The boat is at

rest in the middle of the lake. Calculate the centre of mass of the system. If the dog

moves to the other end of the boat, the girl staying at the same place, how far and in

what direction does the boat move?

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