Một vật dao động điều hòa với phương trình x = 6cos (4t + /6) cm. Hãy xác định thời điểm thứ 2014 vật có động năng bằng thế năng? A. 12049/24s B. 12079/48s C. 12087/48s D. 12085/48s

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)