The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.5. The mass of the object is 15 kg. What is the force of friction?
Help m

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

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.

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?