Why is people asking for segges this is so annoying how do i block them help mee

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).

Which form of pure carbon is so hard that it can be used in cutting tools?