An object is orbiting at a distance of 10,000km from the center of a planet. the gravitational force between the object and the planet is 10n what would the gravitational force be if the object were orbiting at a distance of 5,000km? (pls show work)

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.