Storing Energy in a Book: Get Answers Now!

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URGENT! energy question please help!

I really don't understand this question. Can anybody solve it?

How can you store energy in a book?

PLEASE HELP ME!
 
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You can store energy in the form of graviational potential energy in a book by lifting it up.
 

Thread 'Why can't Solar panels be hemispherical, or a curved strip type?'

comparing a flat solar panel of area 2π r² and a hemisphere of the same area, the hemispherical solar panel would only occupy the area π r² of while the flat panel would occupy an entire 2π r² of land. wouldn't the hemispherical version have the same area of panel exposed to the sun, occupy less land space and can therefore increase the number of panels one land can have fitted? this would increase the power output proportionally as well. when I searched it up I wasn't satisfied with...
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