Created by StemPy LabAt noon, ship B is due east of ship A, as shown in the figure. Ship A sails due north at and ship B sails due west at , both at steady speeds. The smallest distance between the two ships, in kilometres, is ____.
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← A hydrogen atom at rest drops from its first excited state to its ground state and emits a photon of energy 10.2 eV. Take the mass of the atom as 1.67 × 10⁻²⁷ kg, 1 eV = 1.6 × 10⁻¹⁹ J and c = 3 × 10⁸ m/s. The speed with which the atom recoils is closest toAn electric kettle rated 1000 W heats 2 kg of water from 20°C to 100°C. Only 80% of the electrical energy goes into the water; the rest heats the kettle and the air. The specific heat of water is 4200 J kg⁻¹ K⁻¹. The time taken, in minutes, is ____. →
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