A pyramid has a square base and four faces, which are equilateral triangles. A charge Q is placed on the center of the base of the pyramid. What is the net flux of electric field ΦE,1ΦE,1 emerging from one of the triangular faces of the pyramid? Express your answer in terms of Q and the permittivity of free space, 0.

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.

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine