A 0.50 kg water balloon is dropped from a third story window which is 18.0 m above the sidewalk. What is the speed of the ball just before it strikes the
sidewalk

What is the fate of the electrons that interact with a specimen in an electron microscope?

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

What is the equation for electrical work?