The initial velocity of a 4.0-kg box is 11 m/s, due west. after the box slides 4.0 m horizontally, its speed is 1.5 m/s. determine the magnitude and the direction of the non-conservative force acting on the box as it slides.

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?