6: Một vật chuyển động thẳng biến đổi đều theo phương trình x = 400 + 10 – 2 + t2 (x: m;
t: s). Xác định
a/ tọa độ ban đầu, vận tốc ban đầu.
b/ gia tốc của chuyển động.
c/ quãng đường vật đi được sau khoảng thời gian t = 20 s.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.