Astudent throws a ball horizontally at 25 meters per second from a cliff 45 meters above the level ground. how far from the base of the cliff does the ball hit the ground? (neglect air resistance)

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?

Positrons are spontaneously emitted from the nuclei of

How to tell if a molecule is polar or nonpolar with electronegativity