What is the difference between the highest frequency heard by a student in the classroom and the initial frequency of the sound generator?

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.

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?