Created by StemPy LabA transformer connected to the mains supplies to a lamp that uses . The efficiency of the transformer is . The current drawn from the mains, in milliamperes, is ____.
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← A ball is dropped from a height of 6 m onto a hard floor. The coefficient of restitution between the ball and the floor is 0.5, so after each bounce the ball rises with half the speed it hit the floor with. Ignoring air resistance, the total distance the ball travels before it comes to rest, in metres, is ____.In the Bohr model of the hydrogen atom, the electron goes round the nucleus a certain number of times each second. The ratio of this number in the ground state (n = 1) to that in the first excited state (n = 2) is ____. →
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