Which way do electrons within a rectangular rod move when a negatively-charged balloon is brought near a positively-charged rod?

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

What is the speed of an object at a given moment?

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight