Un pendul este suspendat de un ax cu o tijă subțire foarte ușoară. Date m=100 g, l=0,5m, g=9,8 m/s 2
a) Ce viteză minimă este necesară pentru ca pendulul să parcurgă cercul complet.
B) Aceeași întrebare dacă pendulul e suspendat cu un fir
C)Cât este raportul celor două viteze calculate?

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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Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)