An elevator of mass 250 kg is carrying two persons whose masses are 50 kg and 100 kg 1f the force exerted by the motor is 3000 N. Taking g as 10m/s calculate the total mass of
the bodies in the elevator.​

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.