screw are different kind of lever
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Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.[1] Visible light is usually defined as having wavelengths in the range of 400–700 nm, or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).[2][3] This wavelength means a frequency range of roughly 430–750 terahertz (THz).
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A screw is an example of an inclined plane.
Explanation:
A screw is a simple machine that consists of an inclined plane wrapped around a cylinder. This spiral inclined plane forms the threads of the screw. When you twist a screw into a piece of wood, you exert an input force on the screw. The ideal mechanical advantage of wedges and screws is always greater than 1.
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