Nel suo giretto quotidiano, un gatto compie uno spostamento di 120m verso nord, seguito da un altro di 72,0 m verso ovest. Determina il modulo e la diezione dello spostamento che il gatto deve compiere per ritornare a casa.

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.