A5 kg block slides to the right at +2 m/s. The coefficient of kinetic friction is 0.4. The coefficient of static friction is 0.7. The block slows. Once it comes to rest, what is the force of friction on the block?​

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

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 measure of a change in an objects velocity?