Which best explains why the diagram shows refraction but not reflection? a. it shows an incident ray. b. it shows that the ray is changing direction. c. it shows the ray passing through the boundary. d. it shows that angles form between the rays and the normal.

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

What does si stand for,when referring to a system of measurement

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up