Astudent conducted an experiment to measure the acceleration due to gravity 'g' of a simple pendulum.
length of thread , l/m : 0.35
time for 20 oscillations, t/s : 24.1
length of thread, l/m : 0.65
time for 20 oscillations : 3.24
length of thread, l/m : 1.00
time for 20 oscillations : 4.01
lenght of thread, l/m : 1.45
time for 20 oscillations : 47.5
length of thread : 1.95
time for 20 oscillations : 56.3
given that the realtion between the period 't', the length of the pendulum 'l' and the acceleration due to gravity 'g' is t=2(pi)√(l/g), find the value of 'g'.

Calculate the heat capacity per object when the total energy is 4 quanta. (think of this in terms of increasing from 3.5 quanta of energy in the system to 4.5 quanta of energy in the system, if that were possible.) c4 = __ j/k/object

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

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?