Read the following news except from a newspaper article regarding the shelling o

Question

Read the following news except from a newspaper article regarding the shelling of a mine in Ukraine: "The miners didn't hear the impact of the shell and kept extracting coal from the earth more than half a mile below the battlefield. They continued their work for several minutes, oblivious to the danger they were suddenly facing. The shell, said to have been fired on Nov. 22 by the Ukrainian army in its war against pro-Russian separatists, had struck a shed at the state-owned Chelyuskintsev coal mine in the Petrovskyi district, located on the western edge of Donetsk in eastern Ukraine. The resulting explosion damaged the electrical and ventilation systems that serve the mine's deepest shaft. A phone call from the security supervisor at the surface brought troubling news to the deputy director, who was working down below with more than 50 miners: they had just two hours of oxygen left, and the nearest elevator was now unpowered." (Time Magazine, time.com; assessed on February 17, 2015) Assume the following: 53 people were trapped in the mine at the time of the accident The human body needs 19 cubic feet of oxygen per 24 hours I foot = 30.48 cm 1 dm^3 = 1 L Calculate the total volume of oxygen (in Liters) that is needed for the "two hours of oxygen left" mentioned in the excerpt above.

Explanation / Answer

For 53 peoples required amount of oxygen is = 53 x 19 = 1007 cubic feet require in 24 hrs

Therefore for one hr = 1007 / 24 = 41.95 cf

& for 2 hrs = 41.95 x 2 =83.91 cubic feet .

1 cubic feet = 28.31 litres

83.91 cf = 83.91 x 28.31 = 2375.68 litre of oxygen.

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