a pulley system and an inclined plane are being used to slide a crate up a ramp and into a moving truck the inclined plane is 6.00mm long and is 1.50m high. The pulley system uses 4 supporting strands to force the crate up the incline. What is the mechanical advantage of this simple machine?​

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.