Какая связь между работой силы упругости и потенциальной энергией?

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We cannot touch or hold it, but we can see it, and with it, see our world. Light defines our physical, visual and mental experiences. It determines how we move and stirs our emotions.

The exhibition at the Hudson River Museum, The Magic of Light examines

light art as physical sensation. Magic presents work by 14 artists who changed the nature of art by using light rather than paint or stone to create. Their artworks move away from the traditional art objects and focus, instead, on the viewer’s perceptions.

The Magic of Light displays the work of both established and emerging American artists.

The entire museum is the framework of this exhibition.

Five new installations were created especially for The Magic of Light. They reported to the unusual spaces and varied architecture in and around the museum’s complex of galleries, courtyards and the historic Glenview Mansion. For example, the thousands of lights in Erwin Redl’s Matrix I cover the 100-foot south wall of the Museum’s main gallery.

The Magic of Light will be accompanied by a fully illustrated color catalogue with essays by noted art critic Carter Ratcliff, published by The Hudson River Museum.

при нагревании 15,6 г гидроксид аллюминия получили оксид аллюминия.вычислите его массу/
ПОМОГИТЕ ОЧЕНЬ НАДО.заранее спасибо 

решите пожалуйста оба варинта прошу на завтра срочно нужно задание во влажениях))))))))))

докажите что выражение (m-9)^2-m^2 делится на 9 при любых натуральных значениях m