When an object moves in a circle, what is its displacement equal to? how do you know?

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is