When water changes into vapor this is called?

What happens to light waves from a star as the star moves away from earth?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.