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Calculate the number 410

NUMBERMANIA: Calculate the number 410 using numbers [2, 8, 4, 1, 67, 287] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 44

The first user who solved this task is Sanja Šabović.

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That seat is reserved

A man on the train said: "That seat is reserved." I said: "Well, it's been very forward with me." Pulled up my pants and went on my way.

Lou Sanders

Picture: BBC

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Hydrogen-cooled generator

In 1941, the first hydrogen-cooled electrical generator for outdoor installation in the U.S. was put into operation. Built by the General Electric Company for the city of Glendale, Cal., it was rated 20,000 kW and cost $391,669. It was mounted on an open deck. (The first GE-built, hydrogen-cooled indoor generator started operation started on 12 Oct 1937). In modern hydrogen-cooled turbo-generators, hydrogen is used as a coolant fluid. The stator core is direct cooled with hydrogen, for example, at a pressure of 3-6 bar. The advantage of hydrogen is a high thermal conductivity and lower friction than air-cooled generators, thus more efficient operation, lower fuel consumption, highest output capacity, and lowest operating cost.*

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