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Mathematics 5 Online
OpenStudy (anonymous):

It takes 65,000 solar cells,each 1.25 in. by 2.75in. ,to power the Helios Prototype.How much surface area in square ft must be covered with the cells?The cells on Helios are 18 % efficient.Suppose they were only 12% efficient, How much more surface area would need to be covered to deliver the same amount of power?

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