When people look through a telescope, air currents in the earth’s atmosphere can distort the images they see. in the 1950s, a scientist named h. w. babcock thought of a way to reduce this distortion by using a special device within the telescope. however, this device was not used until the 1990s. which best explains why babcock’s idea took many years to become a reality?

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

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?

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.