19) At a certain distance from the center of Earth, a 4.6-kg object has a weight of 2.2 N.
Find the distance

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.

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Asystematic approach to problem solving is called a (an)