Câu 2: Vật nhỏ chuyển động theo phương trình 2 r t i t j   2 3sin   
(SI). Coi rằng π
2 = 10. Độ lớn
vận tốc của chất điểm tại thời điểm t = 10s là:
A. 24,6 m/s. B. 41,1 m/s. C. 52,3 m/s. D. 18,6 m/s.

Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot

Which of the following is an example of motion in two dimensions?

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.