lúc 5h sáng xe bắt đầu chuyển động sau 2h thì xe dừng lại chọn mốc thời gian là 3h xác điểm thời điểm xe khởi hành và xe dừng lại

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Observations show that interstellar clouds can have almost any shape and