Alvin and Theodore race across a parking lot 337 cm long. Alvin travels at 18.67 cm/s and Theodore at 12 cm/s. When the Alvin crosses the finish line, how far behind is Theodore?

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Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

What do we mean by the event horizon of a black hole?