Municipal water supplies are often provided by reserviors built on high ground. Why does water from such a high reservior flow more rapidly out of a faucet on the ground floor of a building than out of an identical faucet on a high floor

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

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

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds