Two buses P and Q are moving in opposite directions with velocities 15 m/s and 12 m/s respectively from the same place at the same time. Calculate the relative velocity
of P with respect to Q after 1 second
[Ans: 27 m/s]

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

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

The ability to make things happen is also called a. heat b. force c. matter d. energy