A 2.75 kg particle moves as function of time as follows: x(t) = 5cos(1.25t+π/4); where distance is measured in meter and time in seconds. (a) What is the amplitude, frequency,
angular frequency, and period of this motion? (b) What is the equation of the velocity of
this particle? (c) What is the equation of the acceleration of this particle? (d) What is the
spring constant? (e) What are the equations for the potential and kinetic energies of the
particle? (f) What is the total energy

Astate of matter all that has define volume and can flow is a(n)

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

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.