Ascrewdriver is used to pry the lid off a paint can. the resistance arm is 0.5 cm long and the effort arm is 20 cm long. what is the mechanical advantage of the screwdriver?

Need in all of themmm only answer if you know pls

Write the correct abbreviation for each metric unit

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?