Một vật dao động điều hòa có phương trình x = 10cos (5πt - π/2) cm a) xác định li độ, vận tốc, gia tốc của vật tại thời điểm t = 0,5s

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9

The discovery of the electron as a subatomic particle was a result of