Chọn phát biểu đúng. Trong công thức của chuyển động thẳng nhanh dần đều: A. v luôn luôn dương. B. a luôn dương.
C. a luôn cùng dấu với v. D. a luôn ngược dấu với v.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Hey student studies gravity using objects that have the same mass which two objects have the greatest gravitational force acting between them a. 100kg 1.0m 100kg b. 100kg 2.0m 100kg c. 100kg 2.0m 100kg big d. 100kg big 3.0m 100kg big

In science and physics what is the standard unit of measure for speed?