Physics for Beginners: Vectors, Velocity, Gravity & Motion

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Im trying to understand physics and i was wondering if there were any good sites out there for beginning physics, like vectors, velocity, gravity, relative motion. Any help would be appreciated.
 
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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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