The IMA of the following pulley system is . 3 4 5 6 7

The ph is the a.independent variable b.the dependent variable c.control group

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.