A camera lens used for taking close-up photographs has a focal length of 22.0 mm. The farthest it can be placed from the film is 33.2 mm. What is the closest object that can be photographed?

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

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Select the three ways that the parallel-plate capacitor differs from a car battery.