Which of the following describes sound waves A. Waves that do not require a medium and in which the vibrations are parallel to the motion of the sound
B. Waves that require a medium and in which the vibrations are perpendicular to the motion of the sound
C. Waves that do not require a medium and in which the vibrations are perpendicular to the motion of the sound
D. Waves that require a medium and in which the vibrations are parallel to the motion of the sound

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.

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.