A man walks 18m East then 9.5 North. What is the direction of his displacement?

The direction of his displacement is the arctangent of (9.5/18).

That's tan⁻¹ (0.528) . . . about 27.8° north of east.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.