The speed of sound through liquid glycerol is about 1900 m/s. Which of the following could be the speed of sound through solid steel? A.

150 m/s

B.

730 m/s

C.

1900 m/s

D.
5950 m/s

Most energy in an ecosystem comes originally from_

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?

There are weak or strong attractive forces between atoms of liquids with a high viscosity