a person of mass 50kg is on the weighing machine in elevator. find its weight when alevator moves upward with a=3m/s^2
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Answers
Explanation:
answer is 7m/s².Hope it helps
Fractional distillation of air
About 78 per cent of the air is nitrogen and 21 per cent is oxygen. These two gases can be separated by fractional distillation of liquid air.
Liquefying the air
Air is filtered to remove dust, and then cooled in stages until it reaches –200°C. At this temperature it is a liquid. The air has been liquefied.
Here's what happens as the air liquefies:
water vapour condenses, and is removed using absorbent filters
carbon dioxide freezes at -79°C, and is removed
oxygen liquefies at -183°C
nitrogen liquefies at -196°C
The liquid nitrogen and oxygen are then separated by fractional distillation.
The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions, the column is warmer at the bottom than it is at the top.
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