A1.6 kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 n/m. the block is pulled from its equilibrium position at x= 0.00m to a displacement x = +0.080 m and is released from rest. the block then executes simple harmonic motion along the horizontal x-axis.

a) what is the velocity of the block at time t = 0.40s?

b) what is the period of the motion?

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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

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