Many common objects are simple machines or combinations of simple machines. Which of the following machines uses a pulley system? yo-yo

window blinds

wheelbarrow

can opener

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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bioteacher101

the growth of the plants is affected by the heat of the light. what is the student doing?

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.