A2 kg mass hangs motionless from a partially stretched spring having a spring constant of 172 n/m. what is the magnitude of the force (in n) that would be required to pull the mass down by an additional 5 cm? never include units with your answer.

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.