16. A ten-loop coil having an area of 0.23m2 and a very large resistance is in a 0.047T uniform magnetic field oriented so that the maximum flux goes through the coil. The coil is then rotated so that the flux through it goes to zero in 0.34s. What is the magnitude of the average emf induced in the coil during the 0.34s

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

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.