Created by StemPy LabA small object lies on the principal axis of a concave mirror of focal length . At the instant it is in front of the mirror, it is moving along the axis towards the mirror at . The speed of its image at that instant, in m/s, is ____.
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← Singly charged positive ions pass straight, without bending, through a region where an electric field of 2.0 × 10⁴ V/m and a magnetic field of 0.2 T are perpendicular to each other and to the ions' path. The ions then enter a region with only a uniform magnetic field of 0.5 T, perpendicular to their velocity, where they move in a circle of radius 4.15 cm. Take e = 1.6 × 10⁻¹⁹ C and 1 u = 1.66 × 10⁻²⁷ kg. The mass of each ion, in atomic mass units, is ____.A nuclear power station produces 16 MW of electrical power. Its efficiency, from the energy released in fission to electrical energy, is 50%. Each fission of a uranium-235 nucleus releases 200 MeV. Take 1 MeV = 1.6 × 10⁻¹³ J. If the number of fissions taking place each second is N × 10¹⁷, the value of N is ____. →
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