Why is circular motion at constant speed not a natural state of motion?

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

Blank liquids and gases exert a buoyant force on objects placed in them

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap