Q21. Mary is riding a roller coaster. Her mother who is standing on the ground behind...

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Q21. Mary is riding a roller coaster. Her mother who is standing on the ground behind her yells out to her at a frequency of 1000 Hz, but it sounds like 920 Hz. (Vind343 m/s). Which one is correct about the problem and Marys speed? A) Moving observer away from the source with the speed 27.4 m/s B) Moving source away from the observer with the speed 2.74 m/s C) Moving source towards the observer with the speed 27.4 m/s D) Moving observer towards the source with the speed 27.4 m/s E) Moving observer away from the source with the speed 2.74 m/s

Q25. A container has a vertical tube, connected to it at its side, as shown in the figure. An unknown liquid reaches level A in the container and level B in the tube. The level A being 5.0 em higher than level B. The liquid supports a 20-cm high column of oil, between levels B and C, whose density is 900 kg/m3. The density of the unknown liquid is closest to A) 2800 kg/m B) 3900 kg/m C) 3600 kg/m D) 3100 kg/m E) 3300 kg/m 20 cm 150cm

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app 343 loOO 34g 4

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Q21. Mary is riding a roller coaster. Her mother who is standing on the ground behind...

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