Created by StemPy LabAn ambulance moves at straight towards a person standing still by the road. Its siren sounds at a steady frequency of . The air is still, and the speed of sound is . The frequency heard by the person, in hertz, is ____.
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← A block of mass 4 kg is released from rest at the top of a smooth track shaped like a quarter of a circle of radius 1.8 m. At the bottom, the track joins a smooth horizontal floor, where a block of mass 2 kg is at rest. The two blocks collide head-on, and the collision is perfectly elastic. Taking g = 10 m/s², the speed of the 2 kg block after the collision, in m/s, is ____.Two resistors of 400 Ω each are connected in series across an ideal battery of 84 V. A voltmeter whose own resistance is 400 Ω is connected across one of the resistors. The reading of the voltmeter, in volts, is ____. →
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