A1.2-kg mass is projected from ground level with a velocity of 30 m/s at some unknown angle above the horizontal. a short time after being projected, the mass barely clears a 16-m tall fence. disregard air resistance and assume the ground is level. what is the kinetic energy of the mass as it clears the fence

Which property of fossils allow scientists to determine the relative rock ages..

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

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.