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A police car is approaching you at 144 km/h. The siren of the car emits a 600-Hz note. Take the speed of sound to be

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A police car is approaching you at 144 km/h. The siren of the car emits a 600-Hz note. Take the speed of sound to be 340 m/s. What frequency do you hear? O 364.6 Hz O 575.4 Hz 680 Hz O 750 Hz O 900 Hz The pistons of a hydraulic life have diameters 10 cm and 40 cm respectively. How large a force must be applied to the smaller piston to lift a 1200 kg car? O 600 N O 9,000 N O 735 N O 1,150 N

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