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Calculate the number 920

NUMBERMANIA: Calculate the number 920 using numbers [4, 3, 7, 7, 28, 834] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 1

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Does an executioner who gets nervous ...

Does an executioner who gets nervous about sending an aristocrat to the gallows suffer from performance hang-society?

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Galileo Ferraris

Born 31 Oct 1847; died 7 Feb 1897 at age 49.Italian physicist who studied optics, acoustics and several fields of electrotechnics, but his most important discovery was the rotating magnetic field. He produced the field with two electromagnets in perpendicular planes, and each supplied with a current that was 90º out of phase. This could induce a current in a incorporated copper rotor, producing a motor powered by alternating current. He produced his first induction motor (with 4 poles) in May-Jun 1885. Its principles are now applied in the majority of today's a.c. motors, yet he refused to patent his invention, and preferred to place it at the service of everyone.«

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