Crime scene as the siren approaches
A cop car drives at 30 m/s toward the scene of a crime, with its siren sounding (f = 2125 Hz.) Calculate the frequency heard by people at the crime scene as the siren approaches and the frequency heard as the siren moves away from the people.
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A firefighter of mass 89 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
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