What two factors will most likely change the speed of a mechanical wave?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

Slab pull” is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subduction of the lithosphere true or false