Aball is shot straight up from the surface of the earth with an initial speed of 19.6 m/s. neglect any effects due to air resistance. how much time elapses between the throwing of the ball and its return to the original launch point?

Why is metal often used for cooking pan?

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

Describe the function of the endomembrane system? what organelles are involved?