A football quarterback runs 13 m straight down the playing field in 2.2 s (in the positive direction). He is then hit and pushed 2.5 m straight backwards in 1.8 s. He breaks the tackle and runs straight forward another 23 m in 4.8 s. show answer No Attempt 25% Part (a) Calculate the quarterback's average velocity in the horizontal direction during the first interval, in meters per second.

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

How is the gravitational force related to the distance between two objects?