Define refraction and state the laws of refraction?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration