A 10-kg crate is at rest on a rough horizontal floor despite the application of a horizontal force of 20 N. The coefficient of static friction between the floor and the crate is 0.5. The static frictional force is equal to:

What statements accurately describe atoms

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm