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If the linear density of the wire is 0.01 kg/m, what is the tension in the wire? 4. (15points) What is the acceleration of gravity at a place where a pendulum 150.3 cm long makes 100 vibrations in 246.7 seconds? 5. (20 points) A train approaches a station platform at a speed of 10 m/s, blowing its whistle at a frequency of 100 Hz, as measured by the engineer What for