Suppose that you are viewing a soccer game from a helicopter above the playing field. two soccer players simultaneously kick a stationary soccer ball on the flat field; the soccer ball has mass 0.420 kg. the first player kicks with force 162 n at 9.0° north of west. at the same instant, the second player kicks with force 215 n at 15° east of south. find the acceleration of the ball in i ^ and j ^ form.

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.