Which of the following gasses is the result of life forms being present on earth? a. oxygen b. carbon dioxide c. water vapor

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

If you let go of the notebook after lifting it, will it move? how?